Final answer:
To find the hydronium ion concentration, divide the water ion-product constant (1.0 x 10^-14) by the given hydroxide ion concentration (1.5 x 10^-10 M), resulting in a hydronium ion concentration of 6.67 x 10^-5 M.
Step-by-step explanation:
To calculate the hydronium ion concentration ([H3O+]) given the hydroxide ion concentration ([OH−]), we use the water ion-product constant (Kw), which is the product of the concentrations of these ions at a given temperature. At 25°C, Kw is 1.0 × 10−14.
The formula to use is [H3O+] = Kw / [OH−]. Given [OH−] = 1.5×10−10 M, we substitute this value into the formula:
Kw = 1.0 × 10−14 M2
[OH−] = 1.5 × 10−10 M
So, [H3O+] = 1.0 × 10−14 M2 / 1.5 × 10−10 M = 6.67 × 10−5 M.