Question

In: Chemistry

1. The Ka of hypochlorous acid (HCLO) is 3.0x10-8. What is the pH at 25 C...

1. The Ka of hypochlorous acid (HCLO) is 3.0x10-8. What is the pH at 25 C of an aqueous solution that is .0200 M in HCLO?

2. A .10 M aqueous solution of the weak base B at 25 C has a pH of 8.00. The Value of Kb for B is _____.

Expert Solution

1. HClO ---------------------> H^+ (aq) + ClO^-

I 0.02 0 0

C -x +x +x

E 0.02-x +x +x

ka = [H^+][ClO^-]/[HClO]

3*10^-8 = x*x/0.02-x

3*10^-8 *(0.02-x) = x^2

x = 2.45*10^-5

[H^+] = x = 2.45*10^-5 M

PH = -log[H^+]

= -log2.45*10^-5

= 4.6108

2. PH = 8

POH = 14-PH

= 14-8 = 6

POH = 1/2Pkb -1/2logc

6 = 1/2Pkb-1/2log0.1

6 = 1/2Pkb -1/2*-1

6 = 1/2Pkb +0.5

1/2Pkb = 6-0.5

1/2Pkb = 5.5

Pkb = 11

-logKb = 11

Kb = 10^-11 >>>>answer

queen_honey_blossom answered 2 years ago

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