# 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

###### FREE Expert Solution
81% (435 ratings)
###### Problem Details

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

What scientific concept do you need to know in order to solve this problem?

Our tutors have indicated that to solve this problem you will need to apply the pH and pOH concept. You can view video lessons to learn pH and pOH. Or if you need more pH and pOH practice, you can also practice pH and pOH practice problems.

What is the difficulty of this problem?

Our tutors rated the difficulty ofIn water, the equilibrium 2H2O(l) ⇌ H3O+ (aq) + OH−(aq)    ...as medium difficulty.

How long does this problem take to solve?

Our expert Chemistry tutor, Dasha took 5 minutes and 37 seconds to solve this problem. You can follow their steps in the video explanation above.

What professor is this problem relevant for?

Based on our data, we think this problem is relevant for Professor Ochoa's class at UCD.