1)

Which of the following solutions is a good buffer system?

Which of the following solutions is a good buffer system?

A solution that is 0.10 M HCN and 0.10 M LiCN

A solution that is 0.10 M NaCl and 0.10 M HCl

A solution that is 0.10 M KOH and 0.10 M HNO3

A solution that is 0.10 M HNO3 and 0.10 M KNO3

A solution that is 0.10 M HCN and 0.10 M Na Cl

2)

Calculate the pH of the solution that results fromeach of the following mixtures.

Part A

55.0 mL of 0.17 M HCHO2 with70.0 mL of 0.13 M NaCHO2

Express your answer using two decimal places.

Part B

115.0 mL of 0.11 M NH3 with250.0 mL of 0.11 M NH4Cl

Express your answer using two decimal places.

3)

A 1.0-L buffer solution is0.125 M in HNO2 and0.180 M in NaNO2.

Part A

Determine the concentrationsof HNO2 and NaNO2 after addition of1.5 g HCl.

Express your answers using three significant figures separatedby a comma.

Part B

Determine the concentrationsof HNO2 and NaNO2 after addition of1.5 g NaOH.

Express your answers using three significant figures separatedby a comma.

Part C

Determine the concentrationsof HNO2 and NaNO2 after addition of1.5 g HI.

Express your answers using three significant figures separatedby a comma.

4)

A ligand is a molecule or ion that acts as a

A ligand is a molecule or ion that acts as a

Lewis acid

Arrhenius base

conjugate base

Brønsted-Lowry base

Lewis base

5)A buffer contains significant amounts of acetic acid andsodium acetate.

Part A

Write an equation showing how this buffer neutralizes addedacid (HCl).

Express your answer as a chemical equation.

Part B

Write an equation showing how this buffer neutralizes addedbase (Ca(OH)2).

Express your answer as a chemical equation.

6)

When titrating a monoprotic strong acid with a weak base at25°C, the

When titrating a monoprotic strong acid with a weak base at25°C, the

	pH will be 7 at the equivalence point.
	titration will require more moles of the base than acid toreach the equivalence point.
	pH will be less than 7 at the equivalence point.
	titration will require more moles of acid than base to reachthe equivalence point.
	pH will be greater than 7 at the equivalence point.