Question

05. If 100 mL of pH = 3 and 400 mL of pH = 3
is mixed, what will be the pH of the mixture
(1) 3.2 (2) 3.0 (3) 3.5 (4) 2.8​

Answer 1

Answer:

3.0

Explanation:

as both ph are same after mixing ph remains same as both are acidic

Answer 2

The pH of the mixture will be 3.0

Explanation:

pH or pOH is the measure of acidity or alkalinity of a solution.

pH is calculated by taking negative logarithm of hydrogen ion concentration.

$pH=-\log [H^+]$

a) For pH= 3 in 100 ml

$3=-\log [H^+]$

$[H^+]=10^{-3}$

b) For pH= 3 in 400 ml

$3=-\log [H^+]$

$[H^+]=10^{-3}$

To calculate the molarity of final solution, we use molarity equation:

$M_1V_1+M_2V_2=M_3V_3$

$10^{-3}\times 100+10^{-3}\times 400=M_3\times 500$

$M_3=10^{-3}$

$pH=-log[10^{-3}]=3$

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