Aqueous Ionic Equilibrium 2
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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.
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Solution Summary
The aqueous ionic equilibrium are given. The expert writes an equation showing how the buffer neutralizes added base are given.
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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:
: ...
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