pH = 3 means (H^+) = 1 x 10^-3 mols/L so in 250 mL there will be 1/4 that or 0.25 x 10^-3 or 2.5 x 10^-4 moles/L. One mol contains 6.02 x 10^23 H^+ or
2.5E-4 x 6.02 x 10^23 = ?
To find OH^- in mols/L, remember (H^+)(OH^-) = 1 x 10^-14 and multiply that by 6.02E23 to find the number of OH ions.
How many (a) H+ ions and (b) OH" ions are present in 250 ml of a solution of pH3?
1 answer