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A student prepares a solution of 0.1 M acetic acid and 0.1 M sodium acetate in a 500 mL volumetric flask. If the pH of the solution is initially 4.7, what will be the new pH of the solution after adding 0.01 mol of hydrochloric acid?

asked Jan 22 in Chemical equilibrium by ValentinStec (1.9k points)

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1 answer 118 views

A student prepares a coordination compound [CoBr(NH3)5]SO4 by reacting cobalt(II) sulfate with ammonium bromide and ammonia. However, the student finds that there are two possible products formed in the reaction. Explain the type of isomerism present in the coordination compound and identify the two isomers formed by the student.

asked Jan 22 in Coordination Chemistry by PartheniaBar (2.2k points)

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1 answer 156 views

A student prepared a 0.2 M solution of sodium acetate and the equilibrium reaction for sodium acetate is CH3COO- + H2O ⇌ CH3COOH + OH-. The initial pH of the solution is 9. Calculate the new pH of the solution when 0.1 mol of NaOH is added to it.

asked Jan 22 in Chemical equilibrium by RandolphNola (1.8k points)

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1 answer 72 views

A student performs a chemical reaction in which the theoretical yield of a particular product is 25 grams. After carrying out the reaction, the student recovers only 18 grams of the product. What is the percent yield of the reaction?

asked Jan 22 in Chemical reactions by Melanie86K41 (1.7k points)

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1 answer 95 views

A student performs a chemical reaction between 12.5 grams of magnesium and 15.0 grams of hydrochloric acid to produce magnesium chloride and hydrogen gas. If the theoretical yield of magnesium chloride is 25.7 grams, calculate the percent yield of the reaction.

asked Jan 22 in Chemical reactions by Cameron54A25 (1.9k points)

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1 answer 106 views

A student performed an experiment to synthesize aspirin using 5 grams of salicylic acid and an excess of acetic anhydride. After the reaction was completed, the student collected 4.2 grams of aspirin. What is the percent yield of this experiment?

asked Jan 22 in Chemical reactions by SteveAdamson (1.7k points)

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1 answer 103 views

A student performed an experiment in which 2.1 moles of nitrogen and 0.8 moles of hydrogen react to form ammonia gas. If the equilibrium constant for the reaction is 3.5 x 10^-4 at a certain temperature, what is the equilibrium concentration of ammonia?

asked Jan 22 in Chemical reactions by SherrylIwz83 (2.0k points)

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1 answer 112 views

A student needs to prepare a solution containing 50 g of ethanol (C2H5OH) dissolved in 250 g of water (H2O) at 25°C. Assuming the heat of mixing for ethanol and water is -5.02 kJ/mol, calculate the heat released or absorbed when the two substances are mixed. Express your answer in kJ.

asked Jan 22 in ThermoChemistry by CarmineGaric (2.1k points)

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0 answers 116 views

A student needs to prepare a solution containing 50 g of ethanol (C2H5OH) dissolved in 250 g of water (H2O) at 25°C. Assuming the heat of mixing for ethanol and water is -5.02 kJ/mol, calculate the heat released or absorbed when the two substances are mixed. Express your answer in kJ.

asked Jan 22 in ThermoChemistry by PalmaYuille (2.1k points)

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1 answer 182 views

A student needs to prepare a buffer solution with a pH of 7.20 using acetic acid (CH3COOH) and sodium acetate (NaCH3COO), with a total buffer concentration of 0.20 M. What mass of CH3COOH needs to be added to 200 mL of 0.10 M NaCH3COO to obtain the desired pH? (Ka of CH3COOH is 1.8x10^-5)

asked Jan 22 in Chemical reactions by TomokoSorian (2.2k points)

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A student needs to prepare a buffer solution with a pH of 4.5 using acetic acid (pKa = 4.76) and its conjugate base sodium acetate. The student has 100 mL of 0.1 M acetic acid and has access to sodium acetate. What mass of sodium acetate (in grams) should the student add to the solution to achieve the desired pH?

asked Jan 22 in Chemical reactions by Maura45O7086 (2.5k points)

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1 answer 97 views

A student needs to prepare 500 mL of a buffer solution with a pH of 7.5 using a weak acid HA and its conjugate base A-. HA has a pKa of 4.5 and its initial concentration is 0.2 M. What mass of HA and A- should be mixed to prepare the buffer solution?

asked Jan 22 in Chemical reactions by DeenaTrundle (2.2k points)

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1 answer 107 views

A student needs to find the enthalpy of polymerization of ethylene from the enthalpies of combustion of ethylene gas (-1411 kJ/mol) and polyethylene (-5120 kJ/mol). Calculate the enthalpy change, in kJ/mol, for the polymerization of ethylene gas to form polyethylene.

asked Jan 22 in ThermoChemistry by TracieM73151 (2.5k points)

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1 answer 109 views

A student needs to find out how much heat is released or absorbed when 100 mL of 0.1 mol/L solution of barium chloride (BaCl2) is mixed with 150 mL of 0.1 mol/L solution of sodium sulfate (Na2SO4) at 25°C. Given the enthalpy of precipitation of BaSO4 as -256 kJ/mol, calculate the enthalpy change (in kJ) for the reaction that occurs and determine whether the reaction is exothermic or endothermic.

asked Jan 22 in ThermoChemistry by BrainRubin29 (2.2k points)

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1 answer 113 views

A student needs to determine the standard electrode potential for the following reaction: Fe3+ + e- → Fe2+ Using the standard electrode potentials of Fe3+/Fe2+ and Ag+/Ag, calculate the standard cell potential for the following reaction: 2Ag+ (aq) + Fe(s) → 2Ag(s) + Fe2+ (aq) Determine if this reaction is spontaneous or nonspontaneous under standard conditions.

asked Jan 22 in ElectroChemistry by GeraldoPatte (1.7k points)

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1 answer 105 views

A student needs to determine the mass of silver that can be deposited on a silver electrode using a current of 2.5 A for 3 hours in a solution containing 0.2 M silver ions. What is the mass of silver deposited on the electrode? (Assuming 100% current efficiency and atomic weight of silver is 107.9 g/mol)

asked Jan 22 in ElectroChemistry by MuhammadNuna (2.1k points)

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1 answer 110 views

A student needs to determine the enthalpy change of a chemical reaction using the Hess's Law equation. They have the following information:- The enthalpy change for Reaction 1 is -210 kJ/mol- The enthalpy change for Reaction 2 is -325 kJ/mol- The enthalpy change for Reaction 3 is 155 kJ/molThe student needs to use Hess's Law to calculate the enthalpy change for the following reaction:4A + 3B → 2CGiven the information above, what is the enthalpy change for the reaction?

asked Jan 22 in Chemical reactions by LamontMccror (1.9k points)

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1 answer 109 views

A student needs to determine the enthalpy change (ΔH) for the reaction between ammonium nitrate (NH4NO3) and water (H2O) using Hess's Law calculations. Given the following information: - ΔHf° (NH4NO3) = -365.4 kJ/mol- ΔHf° (HNO3) = -207.3 kJ/mol- ΔHf° (NH4+) = -132.5 kJ/mol- ΔHf° (NO3-) = -206.1 kJ/mol- ΔHf° (H2O) = -285.83 kJ/molFormulate the thermochemical equation for the reaction by using the given data and Hess's Law calculations, and then calculate the enthalpy change for the reaction.

asked Jan 22 in ThermoChemistry by LeannaCremea (1.6k points)

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1 answer 92 views

A student needs to determine the diffusion coefficient of a gas in a liquid by measuring the rate of diffusion using a diffusion cell. If the student knows the initial concentration and final concentration of the gas in the cell, and the time it took for diffusion to occur, what is the diffusion coefficient of the gas in the liquid?

asked Jan 22 in Physical Chemistry by MistyReagan2 (1.4k points)

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1 answer 147 views

A student needs to determine the diffusion coefficient of a gas at a given temperature and pressure using Graham's law of diffusion. The student has the necessary equipment to measure the rate of diffusion of the gas and the molecular weight of the gas is known. Determine the diffusion coefficient of the gas.

asked Jan 22 in Physical Chemistry by BradCoz53277 (1.9k points)

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