Question

If pH value of a solution is 3 and by adding water, it becomes 6, then the dilution is increased by

(a) 500 times 

(b) 10 times

(c) 1000 times 

(d) 100 times

Answer 1

Correct option  (c) 1000 times 

Explanation:

Given: Initial pH= 3 and final pH = 6. We know that pH ∝  Dilution. Therefore, initially [H⁺] = 10^-3 and after dilution [H⁺] = 10^-6. Thus increase in dilution

Answer 2

Option C is correct

Explanation

Let the concentration of first acid solution of pH=3 be C M

So -logC=3=>C=10^-3M

After dilution if concentration be C' then

-logC'=6 => C'=10^-6M

Hence dilution is increase by 1000 times