Question

If a solution's hydronium ion concentration is 1.0E-10 what is it's hydroxide ion concentration?Express your answer in Scientific notation using the format where 1.0 x 102 would be written as 1.0E2 no spaces allowed

Answer 1

`\text{ Kw = }\lbrack\text{H}_3\text{O}^+\rbrack\lbrack\text{OH}^-\rbrack`
`\lbrack\text{OH}^-\rbrack\text{ = }\frac{\text{ Kw}}{\lbrack\text{ H}_3\text{O}^+\rbrack}=(1*10^(-14))/(1*10^(-10))=1*10^(-4)`

The answer is [OH-] = 1.0E-4