First slide

PH of strong acids and strong bases

Question

20 ml of 0.4 M H₂SO₄ and 80 ml of 0.2 M NaOH are mixed. Then the pH of the resulting solution is

Moderate

A

7
B

1.097
C

12.903
D

11.903

Solution

On mixing, the following reaction take place

H₂SO₄ + 2NaOH $\large \rightarrow$ Na₂SO₄+2H₂O

Milli

moles
= 20 x 0.4 80 x 0.2

= 8 16

Since there is no limiting reagent, acid and base will be completely neutralised.
PH of a neutral salt (Na₂SO₄) solution is 7.

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