A sample of grape juice has a hydroxide ion concentration of 1.4 * 10-10 M

What is the concentration of hydronium ion?

__x 10 x^-5 M

The relation between hydroxide ion (OH-) and hydronium ion (H3O+) is given by:

pH + pOH = 14, which is equivalent to [H3O+] [OH-] = 10^ - 14

=> [H3O+] = (10^ - 14) / [OH-] = (10^ - 14) / (1.4*10^-10) = 0.71 * 10^ - 4 = 0.071 * 10^-5

Answer: 0.071 * 10 ^ - 5