1. The Kb for NH3(aq) is:
A) -5.8 E 10^-10
B) 1.0 E 10^-14
C) 1.7 E 10^-5
D) 1.7 E 10^ 9
E is supposed to look fancy and curly, I don’t remember what it’s supposed to be called. Anyway, C?
2. Which of the following is a correct statement concerning an aqueous solution?
A) As [H3O+ (aq)] increases, [OH (aq)] decreases.
B) As [H3O+ (aq) big] increases, [OH (aq)] increases.
C) As pH increases, [OH - (aq)] decreases.
D) As pH increases , [H3O+ (aq)] increases.
Is it D?
3. You have been given two unlabelled acidic solutions. One is a weak acid and one is a strong acid, but they have the same pH. Which of the following statements about the two acids is true?
A) The weak acid more easily releases hydrogen ions and is more concentrated than the strong acid.
B) The strong acid more easily releases hydrogen ions and is more concentrated than the weak acid.
C) The weak acid more easily releases hydrogen ions and is less concentrated than the strong acid.
D) The strong acid more easily releases hydrogen ions and is less concentrated than the weak acid.
4. When citric acid combines with water in the mouth, one reaction that occurs is:
H3Ct (aq) + H2O (l) H2Ct- (aq) + H3O+ (aq)
The conjugate acid-base pairs in this equation are...
A) H3Ct (aq) / H 3 O+ (aq) and H2O (l) / H2Ct- (aq)
B) H3Ct (aq) / HCt^2- (aq) and H3O+ (l) / H2O (l)
C) H3Ct (aq) / H 2 O (l) and H3O+ (aq) / H2Ct- (aq)
D) H3Ct (aq) / H 2 Ct (aq) and H3O+ (l) / H2O (l)