One litre of 1 M solution of an acid HA ( at 25°C) has pH = 2

CHEMISTRY · Subjective · A Level · Chemistry · Acids and bases · Acids and bases

Problem

One litre of 1 M solution of an acid HA (

K_a = 10^{-4}

at 25°C) has pH = 2. It is diluted by water so that new pH becomes double. The solution was diluted to

5 \times 10^a

mL. The value of

a

is.....