JAMB - Chemistry (2002 - No. 17)

Three drops of a 1.0 mol dm-3 solution of NaOH are added to 20 cm3 of a solution of pH 8.4. The pH of the resulting solution will?

Close to that of pure water

Unaltered

Greater than 8.4

Less than 8.4

A strong base is one that fully dissociates to give ions in solution. Weak bases only partially dissociate in a solution,

while the strong bases dissociate fully in a solution. Weak bases have pH 7.3 – 10, strong ones have pH 10 – 14.