# Aqueous Ionic Equilibrium 2

Aqueous Ionic Equilibrium 2

1- Which of the following processes will result in an increase of entropy of the system? Choose from:

2- What does the standard change in Gibbs free energy ( ) of a reaction tell us about the equilibrium constant (K) for that reaction under standard conditions? Choose from:

There is no significant relationship between and K.

A negative indicates that product formation is favored, and K will be greater than 1.

A negative indicates that reactant formation is favored, and K will be less than 1.

3- Which of the following combinations of and describe a process that is only spontaneous at low temperatures? Choose from:

: positive , : positive

: negative , : positive

: positive , : negative

: negative , : negative

Spontaneity is not related to the sign of and .

4- AB 2 has a molar solubility of 3.72×10 −4 M . What is the value of the solubility product constant for AB2 ?

5- C 2 D 3 has a solubility product constant of 9.14×10 −9 . What is the molar solubility of C 2 D 3 ?

6- A buffer contains significant amounts of ammonia and ammonium chloride.

Part A:Write an equation showing how this buffer neutralizes added acid (HI)

Part B: Write an equation showing how this buffer neutralizes added base (CsOH). Express your answer as a chemical equation.

7- Solve an equilibrium problem (using an ICE table) to calculate the pH of each solution:

Part A: a solution that is 0.165M in HC 2 H 3 O 2 and 0.120M in KC 2 H 3 O 2

Part B: a solution that is 0.185M in CH 3 NH 2 and 0.110M in CH 3 NH 3 Br

8- A 1.0-L buffer solution is 0.105M in HNO 2 and 0.145M in NaNO 2 . Express your answers using three significant figures separated by a comma.

Part A: Determine the concentrations of HNO 2 and NaNO 2 after addition of 1.4g HCl

Part B: Determine the concentrations of HNO 2 and NaNO 2 after addition of 1.4g NaOH .

Part C: Determine the concentrations of HNO 2 and NaNO 2 after addition of 1.4g HI.

#### Solution Preview

Aqueous Ionic Equilibrium 2

1- Which of the following processes will result in an increase of entropy of the system? Choose from:

Entropy will increase when moles of gas increases like when 2 moles of NH3 forms a total of 4 moles of gaseous products N2 and H2.

2- What does the standard change in Gibbs free energy ( ) of a reaction tell us about the equilibrium constant (K) for that reaction under standard conditions? Choose from:

There is no significant relationship between and K.

A negative indicates that product formation is favored, and K will be greater than 1.

A negative indicates that reactant formation is favored, and K will be less than 1.

A reaction will be spontaneous when dG is negative. Hence product formation is favored and K must be greater than 1.

3- Which of the following combinations of and describe a process that is only spontaneous at low temperatures? Choose from:

: ...

#### Solution Summary

The aqueous ionic equilibrium are given. The expert writes an equation showing how the buffer neutralizes added base are given.