WAEC - Chemistry (2000 - No. 16)
If a solution has a pH of 2, it can be concluded that it
is a weak electrolyte
has hyrogen ion concentration of 0.2 mol dm-3
is twice as acidic as a solution of pH 1,
will produce effervescence with magnesium ribbon
Vysvetlenie
When an acid reacts with a metal,Magnesium ribbon, there is an effervescence of hydrogen gas, H2.