Calculate the pH of a 0.043 M HCl solution.a. 1.25b. 1.37c. 12.63d. 12.27e. none of these

the NaOH concentration is 0.07799 M.

we need to find out the NaOH concentration. For this, we'll use the formula for molarity of a solution. Molarity is defined as moles of solute per litre of solution. The formula for Molarity is:

Molarity (M) = Mass of solute in grams / Molar mass of solute × Volume of solution in liters.

So, we can rearrange the formula as:

M = (m/V) × (1/MW)

where M is the molarity of solution, m is the mass of solute, V is the volume of solution and MW is the molecular weight of the solute. Using this formula, we can calculate the NaOH concentration as follows:

Given, mass of KHP = 0.6986 g

Volume of NaOH = 43.92 mL = 0.04392 L

To find: NaOH concentration

Using the given mass of KHP, we can find the number of moles of KHP as:

moles of KHP = mass / molar mass of KHP= 0.6986 / 204.22= 0.003421 mol

Now, using the balanced chemical equation between NaOH and KHP, we can say that: 1 mole of NaOH reacts with 1 mole of KHP.

This means that the number of moles of NaOH used in the reaction = 0.003421 mol

So, using the formula for molarity, we can say that:

Molarity of NaOH = moles of NaOH / volume of NaOH= 0.003421 / 0.04392= 0.07799 M

Therefore, the NaOH concentration is 0.07799 M.

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Two possible sources of systematic (determinate) error in the experiment are; Incorrect calibration of volumetric glasswareIncorrect mass of NaCl

To calculate the concentration of NaCl in the resulting solution in mg/L NaCl, we can use the formula; Concentration (mg/L) = (Mass of solute ÷ Volume of solution in L) × 1000 g / 1 mg NaCl is present in the stock solution of 25 mL. So, the mass of NaCl in the solution would be;0.0842 g ÷ 25 mL = 0.00337 g/mL. Now, in the resulting solution, a 1.00 mL aliquot of the stock solution is transferred to a 50.00 mL volumetric flask and diluted to volume. Therefore, the volume of the resulting solution is 50.00 mL. We will substitute these values in the formula, Concentration (mg/L) = (0.00337 g/mL ÷ 50 mL) × 1000 g / 1 mg concentration (mg/L) = 67.4 mg/L. Therefore, the concentration of NaCl in the resulting solution in mg/L NaCl is 67.4 mg/L.7.  Concentration = 67.4 mg/LTolerance = 4.28 mg/LTotal concentration = 67.4 + 4.28 mg/L = 71.68 mg/LWe round off this value to one decimal place; Total concentration = 71.7 mg/LTherefore, the concentration of NaCl in the resulting solution using propagation of error through the calculation is 67.4+0.4 mg/L.8. Two possible sources of random (indeterminate) error in the experiment are; Errors in temperature measurement. Errors in measurement of water volume. Two possible sources of systematic (determinate) error in the experiment are; Incorrect calibration of volumetric glasswareIncorrect mass of NaCl.

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To determine the number of moles of the gaseous organic compound, we can use the ideal gas law equation: PV = nRT, where P is the pressure, V is the volume, n is the number of moles, R is the gas constant, and T is the temperature.

First, we need to convert the density to mass per volume. The density of the gas is given as 340g/L. Therefore, the mass of 1 L of the gas is 340 g.

Next, we need to use the ideal gas law to calculate the number of moles. We know that the pressure is 1.7 atm, the temperature is 45°C (which is 318 K), and the volume can be calculated using the density and the molar mass of the compound. The molar mass can be determined from the molecular formula of the compound.

Assuming the compound is a hydrocarbon, we can use an average molar mass of 28. Thus, the volume of 1 mole of the gas can be calculated as follows:

V = (molar mass/density) × 1000 ml/L = (28/340) × 1000 = 82.35 ml/mol

Using the ideal gas law equation and plugging in the given values, we get:

n = (PV) / (RT) = (1.7 atm × 82.35 ml) / (0.0821 L atm/mol K ×318 K) = 0.839 mol

Therefore, the number of moles of the gaseous organic compound is 0.839 mol

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The pressure (in atmospheres) of the gas inside the container connected to an open-end, mercury-filled manometer is 1.19 atm

The pressure of a gas inside a container connected to an open-end manometer is given as:

Pressure of gas = Atmospheric presure + pressure due to height

Now, we shall determine the pressure of the gas as illustrated below:

Pressure of gas = Atmospheric presure + pressure due to height

Pressure of gas = 0.95 + 0.24

Pressure of gas = 1.19 atm

Thus, the pressure of the gas is 1.19 atm

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Complete question:

Please attached photo

Explanation:

solubility of potassium nitrate (KNO3) at 5 oC ~ 24 g/100 mL H2O The solubility of potassium nitrate (KNO3) at 25 oC ~ 40 g/100 mL H2O Potassium nitrate (KNO3) is a solid.

Particles can be arranged in a variety of ways. Particles of liquid gold move closer together as it solidifies. Thus, option D is correct.

When a liquid is cooled and transforms into a solid, freezing takes place. A solid is created when the particles in a liquid eventually cease moving and settle into a stable configuration.

Attractive forces start to capture particles, and a solid's crystals start to take shape.

Therefore, the rearrangement of particles in a physical change describes When liquid gold becomes a solid, its particles get closer together.

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Answer:

The answer is option D on indeguity

Explanation:

Given that we want to prepare a 10% solution of sodium hydroxide in 200 mL, we need to calculate the mass of sodium hydroxide required to make this solution.

We can use the following formula to calculate the mass of solute required to make a given volume and concentration of solution:

The density of solid NaOH is 2.13 g/mL. So, the density of sodium hydroxide solution is:

Sodium hydroxide, also known as lye and caustic soda or caustic soda, is an inorganic compound with the chemical formula NaOH. This compound is an ionic compound in the form of a white solid composed of the sodium cation Na⁺ and the hydroxide anion OH⁻. Sodium hydroxide is a building block that can also be found in detergents and oil stain removers. We use it to make products clean better by influencing the formula molecules, so they work better together.

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Answer:

71.92 kPa

Explanation:

Using the combined gas law equation;

P1V1/T1 = P2V2/T2

Where;

P1 = initial pressure (kPa)

P2 = final pressure (kPa)

V1 = initial volume (L)

V2 = final volume (L)

T1 = initial temperature (K)

T2 = final temperature (K)

According to the information provided in this question;

T1 = 50°C = 50 + 273 = 323K

V1 = 105L

T2 = -25°C = -25 + 273 = 248K

P2 = 105.4 kPa

P1 = ?

V2 = 55.0 L

Using P1V1/T1 = P2V2/T2

P1 × 105/323 = 105.4 × 55/248

105P1/323 = 5797/248

0.325P1 = 23.375

P1 = 23.375 ÷ 0.325

P1 = 71.92 kPa

The subatomic particle is not indicated by the atomic number of a neutral atom is neutron.

The subatomic particles is the particles that atom is composed of. The subatomic particles is given as :

The atomic number of the neutral atom is equals to the number of the protons. The number of protons is equals to the number of electrons for the neutral atom. The mass number is equal to the number of protons + number of neutrons.

Thus, the number of neutrons is the subatomic particle that is not indicated by the atomic number of a neutral atom.

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The five elements of chemical change include colour change, precipitate or gas formation, odour change, temperature change, and gas or precipitate formation.

When choosing an indicator for acid-base titrations, pick one whose pH range is compatible with the reaction's pH change. As an illustration, the pH quickly rises from 3 to 11 when a strong acid and base are titrated.

Chemical indicator: Any substance that can be used to detect the presence or absence of a chemical species at a threshold concentration in a solution, such as an acid or an alkali, usually by changing colour. Methyl yellow is a good illustration of this.

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Answer:

kinectic energy of all its molecules

Answer:0

Explanation: zero because it is the most stable form of oxygen in its standard state

Answer:

Nickel (I) Phosphate

Explanation:

PO4 is a -3 ion it will need 3 Ni(I) ion, which is -1 ion. Therefore it is Ni3PO4.

Answer: liquid water 2

Explanation:

Option (d), P=ATC=MR=MC, accurately represents the long-run equilibrium condition for perfect competition, reflecting the balance between price and cost for firms operating in a competitive market.

The long-run equilibrium condition for perfect competition is that price (P) is equal to average total cost (ATC), which is also equal to marginal cost (MC), and marginal revenue (MR).

Option (d), P=ATC=MR=MC, best represents the long-run equilibrium condition for perfect competition. In perfect competition, firms operate at the minimum point of their average total cost curve, where price equals both average total cost and marginal cost. This condition ensures that firms are earning zero economic profit and are producing at an efficient level.

In the long run, if firms are earning economic profit, new firms will enter the market, increasing competition and driving prices down. Conversely, if firms are experiencing losses, some firms may exit the market, reducing competition and causing prices to rise. This process continues until firms reach a state where price equals average total cost, marginal cost, and marginal revenue, ensuring a long-run equilibrium.

Therefore, option (d), P=ATC=MR=MC, accurately represents the long-run equilibrium condition for perfect competition, reflecting the balance between price and cost for firms operating in a competitive market.

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ENC explains all periodic trends

The electrostatic attraction between the positively charged nucleus and the negatively charged electrons holds electrons in an atom or ion. Due to electron shielding that exists between the electron of interest and the nucleus in multi-electron species, the electrons do not experience the full positive charge of the nucleus. The effective nuclear charge is the total positive charge that really affects an electron.

In order to comprehend periodic characteristics, it is crucial to understand the idea of effective nuclear charge (Z*). The portion of the total nuclear charge that an electron in an atom experiences is known as the effective nuclear charge. This is equal to the atomic number (Z) less the amount () by which other atoms' electrons protect the particular atom's nucleus.

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Answer:

10 degrees C

Explanation:

Answer: The concentration of hydrogen ion is 2.5 x 10∧-3.

Explanation:

It is well known that; pH + pOH = 14

∴ pH + 11.40 = 14

  pH = 14 -11.40 = 2.60

Remember that,

pH = - Log [ H+ ]

2.60 = - log [H+]

To get the  hydrogen ion concentration, we take the anti-log of 2.60.

[H+] = Antilog 2.60 = 2.5 x 10∧-3.

Answer:

\(0.30molNH_3\)

Explanation:

Hello there!

In this case, since the reaction for the formation of ammonia is:

\(3H_2+N_2\rightarrow 2NH_3\)

We can evidence the 1:2 mole ratio of nitrogen gas to ammonia; therefore, the appropriate stoichiometric setup for the calculation of the moles of the latter turns out to be:

\(0.15molN_2*\frac{2molNH_3}{1molN_2}\)

And the result is:

\(0.30molNH_3\)

Best regards!

A. The pKa of the indicated proton is 10.

B. The pKa of the indicated proton is 5.

pKa represents the negative logarithmic value of the acid dissociation constant (Ka) in a solution. It serves as a metric for evaluating the potency of an acid—reflecting the strength of its proton binding capacity as a Bronsted acid. A lower pKa value signifies a stronger acid, indicating a heightened ability to donate protons.

pKa values hold significant relevance in comprehending various fundamental chemical phenomena, including acid-base reactions, enzymatic reactions, and chemical equilibrium. Moreover, they find wide-ranging applications spanning drug design, food preservation, and environmental remediation, among others.

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The overpressure at an SD of \(30.3 ft/kg^(1/3)\) is approximately 0.3 psi. Based on the estimated overpressure of 0.3 psi, the expected damage at 100 ft away would be relatively minor.

To estimate the overpressure from the explosion of a BBQ gas cylinder containing 20 lb of propane, we can use the TNT equivalency method. This method is based on the comparison of the energy released by the explosion to that of an equivalent mass of TNT.

1. Calculate the energy released by the propane explosion:
Propane has a heat of combustion of about 46.4 MJ/kg. Convert the 20 lb of propane to kg: 20 lb * 0.453592 kg/lb ≈ 9.07 kg.

2. Calculate the energy released by the propane:
Energy = 9.07 kg * 46.4 MJ/kg ≈ 420.44 MJ.

3. Convert the energy to TNT equivalent:
1 kg of TNT releases approximately 4.184 MJ of energy.
TNT equivalent = 420.44 MJ / 4.184 MJ/kg ≈ 100.5 kg of TNT.

4. Estimate the overpressure at 100 ft distance:
Using the scaled distance concept, we can find the scaled distance (SD) by dividing the distance by the cube root of the TNT equivalent: \(SD = 100 ft / (100.5 kg)^(1/3) = 30.3 ft/kg^1/3\).

5. Refer to overpressure charts or empirical equations for TNT explosions to estimate the overpressure at the scaled distance. For example, using the Kingery-Bulmash model, the overpressure at an SD of \(30.3 ft/kg^(1/3)\)is approximately 0.3 psi.

Based on the estimated overpressure of 0.3 psi, the expected damage at 100 ft away would be relatively minor. Typical damage at this overpressure level may include shattered windows, light structural damage, or tree branches breaking. However, it is important to note that the actual damage may vary depending on factors such as surrounding structures and environment.

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The concentration of the chloride ion is obtained as 0.20 mol/L.

We have to note that the concentration of the solution has to with the amount of the solute that we have in the system. In this case, we can see that we have the Iron (III) chloride (FeCl3) which completely dissociates when dissolved in water.

Now we are told that the concentration of the solute is 0.60 mol/L solution of Iron (III) chloride but each FeCl3 molecule produces three Cl- ions, the concentration of Cl- ions in the solution will be three times the concentration of FeCl3.

Hence;

Concentration of the chloride ion is;

0.60 mol/L/3

= 0.20 mol/L

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A model Suppose that each molecule has a surface area of 2.1–10 cm2. 3. Combine the data from steps 1 and 2 with the previous conversion factors to produce the

Is Water a Molecule?

Molecules are created when atoms are combined. Two h (H) ions one and oxygen (O) atom make all four atoms that make up a water molecule. As a consequence, water is occasionally abbreviated as H2O. There are billions of water molecules in a single drop of liquid.

What do molecules and atoms do?

Atoms are referred to as the "basic building units of matter." The tiniest parts of a substance are the features of a chemical element. One or more atoms are joined together to form molecules using covalent (chemical) bonds.

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Answer:

its A reduces stress :)))

Explanation:

According to Le Chatelier’s principle, a system in chemical equilibrium responds to stress by shifting the equilibrium in a direction that reduces the stress.

Le Chatelier’s principle states that when a chemical equilibrium become imbalance by any change such as change in concentration, temperature, pressure etc. the system will reduces this stress by creating a new equilibrium  state.

By this principle, when temperature increases for an endothermic system, forward reaction will takes place more since the temperature is absorbed there.

Similarly, when the concentration of any reactant increases, the reaction will turn to that direction in  which that reactant is consumed more. If any loss the volume, then the equilibrium will shifts to that direction in which the that substance is produced.

Hence, the system will somehow manage the imbalance by reducing the stress occurred.

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1s², 2s², 2p⁶, 3s², 3p⁶, 4s², 3d³ or [Ar] 4s²3d³

Given

Vanadium, atomic number 23

Required

The electron configuration

Solution

In an atom, there are levels of energy in the shell and subshell  

This energy level is expressed in the form of electron configurations.  

Charging electrons in the subshell uses the following sequence:  

1s², 2s², 2p⁶, 3s², 3p⁶, 4s², 3d¹⁰, 4p⁶, 5s², 4d¹⁰, 5p⁶, 6s², etc.  

The electron configuration is based on the atomic number which indicates the number of electrons of the atom

Vanadium has the atomic number 23, so the number of electrons = 23

Electron configuration:

1s², 2s², 2p⁶, 3s², 3p⁶, 4s², 3d³

or we can write it using the noble gas notation

[Ar] 4s²3d³

Glucose concentration causes yeast to produce more fermentation, but when the saturation gradient is reached, carbon dioxide production stops.

Chemical processes happen when atoms create or dissolve chemical bonds. Products are the molecules that are produced as a result of a chemical reaction, whereas reactants are the ingredients that initiate one.

A chemical reaction happens when one or more substances change into one or more new substances. Consider the rust that results from the reaction between iron and oxygen. When vinegar & baking soda are mixed, sodium acetate, nitrous oxide, or water are the results.

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Answer:

done

Explanation:

Answer:  6.02x10^22 atoms

Explanation:  1.4 grams is (1.4g/28 g/mole) = 0.05 moles of N2.

(0.05 moles)*(6.02x10^23 molecules/mole) = 3.01x10^22 molecules

(3.01x10^22 molecules)(2 atoms/molecule) = 6.02x10^22 atoms

Answer:

the first one looks familiar I don't know where I saw him from