Question

What is the concentration of H3O+ in 0.1 M sodium hydroxide

Answer 1

SOLUTION:
The hydronium ion concentration is represented as [H3O+
] and is the unknown quantity.
The hydroxide ion concentration is represented by [OH-
] and is 1
Using the ion product of water, Kw, we have the following relationship:
Kw = [H3O+
] X [OH-
] where Kw = 1 x 10-14 (at 25C)
Solving for the hydronium ion concentration and substituting gives:
Kw 1 x 10-14
[H3O+
] = CCCC = CCCCCC = 1 x 10-5
[OH-
] 1 x 10-9
So the final hydronium ion concentration is 1 x 10-5 M. Comparison of 1 x 10-5 M versus 1 x 10-9 M.