Chemistry Practice Problems pH and pOH Practice Problems Solution: In water, the equilibrium 2H2O(l) ⇌ H3O+ (aq) + O...

🤓 Based on our data, we think this question is relevant for Professor Raghavachari & Jarrold's class at IU.

# Solution: In water, the equilibrium 2H2O(l) ⇌ H3O+ (aq) + OH−(aq)      Kc = 10−14 determines the concentrations of H3O+(aq) and OH -(aq). If the pH is 9.2, what is the OH - concentration? (note H3O+(aq) and H+(aq) are equivalent ways of representing a solvated proton and pH = -log[H+(aq)].) a) 9.76x10−6 b) 2.31x10−5 c) 3.88x10−4 d) 1.58x10−5 e) 2.54x10−6

###### Problem

In water, the equilibrium

2H2O(l) ⇌ H3O+ (aq) + OH(aq)      Kc = 10−14

determines the concentrations of H3O+(aq) and OH -(aq). If the pH is 9.2, what is the OH - concentration? (note H3O+(aq) and H+(aq) are equivalent ways of representing a solvated proton and pH = -log[H+(aq)].)

a) 9.76x10−6

b) 2.31x10−5

c) 3.88x10−4

d) 1.58x10−5

e) 2.54x10−6

pH and pOH

pH and pOH

#### Q. What is the [H3O+] for a solution at 25°C that has pOH = 5.640? A) 2.34 x 10-4 M B) 2.29 x 10-6 M C) 4.37 x 10-9 M D) 4.27 x 10-11 M E) 8.360 M

Solved • Thu Aug 25 2016 08:13:52 GMT-0400 (EDT)

pH and pOH

#### Q. If the concentration of hydronium ion, [H3O+] = 8.62 x 10 -4, what is the pH of the solution? a. 10.936 b. 0.998 c. 3.064 d.1.6 x 10-11 e. 2.329

Solved • Wed Aug 24 2016 18:53:21 GMT-0400 (EDT)

pH and pOH

#### Q. For a solution with an [OH −] of 10−8 M, what would be the value of [H +] , pH and pOH, respectively? 1. 10−14 M, 6, 8 2. 10−6 M, 6, 8 3. 10−6 M, 8...

Solved • Mon Aug 01 2016 13:35:18 GMT-0400 (EDT)

pH and pOH

#### Q. At 0°C the ion product constant of water,  Kw, is 1.2 x 10–15. The pH of pure water at this temperature is(A) 6.88(B) 7.00(C) 7.46(D) 7.56

Solved • Tue Apr 26 2016 14:42:27 GMT-0400 (EDT)