1 which of the following pairs of species are conjugate pair

1, which of the following pairs of species are conjugate pairs? A. H3P04 and PO43- B. NH4+ and NH2- C. OH- and H2O D. HCI and H30+ 2. What is the [OH-1 in a solution in which [H30+] 0.008 M? A. 8.0x 10-17M C. 1.56 x 10-24 M D. 1.25 x 10-12 M B. 8.0x 1011 M 3. what is the pH of a solution in which the lid[H+ A. 6.50 B. 3.15 3.15 x 10-8 M? C. 8.04 D. 7.50 4. What is the pOH of a solution in which [ A. 9.93 B. 5.53 [OH-] = 8.47 x 10-5 M? C. 8.47 D. 4.07 5. What is the pOH of a solution that is 2.1 x 10-2 M in Ba(OH)2? A. 12.32 C. 1.68 D. 12.62 B. 1.38 6. The Ka of weak acid is 4.8 x 10-5. What is the pH of a 0.58 M solution of this acid? A. 0.24 C. 13.76 D. 11.72 B. 2.28 A 0.057 M solution of a weak acid has pH 5.23. What is the Ka of this acid?

Solution

1. A and C

H3PO4=3H⁺+4OH^-

and H₂0=2H⁺+OH^-

2.D

[H₃O]⁺*[OH]^- =1*10^-14

[OH]=1*10^-14/.008

[OH]=1.25*10^-12

3.PH = -log[H]+

=8.04 so C option correct

4.B

P[OH]=-log[OH]

=-LOG[8.47*10^-5]

=5.53

5.C

6.B