Question

The pH of lemon juice at 298 K is found to be 2.32. What is the concentration of mc014-1.jpg ions in the solution?

Answer 1

pH = -log10[H3O+], so [H3O+] = 10^{-pH} = 10^{-2.32} = 4.79 × 10^{-3} M.

(About 4.8 mmol L^{-1} of H+.)