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GATE Exam Questions - Engineering

Q1:

Two samples of water A and B have pH values of 4.4 and 6.4 respectively. How many times more acidic sample A is than sample B ?

A 0

B 50

C 100

D 200

ANS:C - 100

PH of sample A = -log10(Ha+) = 10^-4.4,
PH of sample B = -log20(Hb+) = 10^-6.4,
PH A/PH B = 10^-4.4/10^-6.4 = 10^2 = 100.
PH A is 100 times acidic Than PH B.