Equilibrium Question 450

Question: When $ 100ml $ of $ M/10NaOH $ solution and $ 50ml $ of $ M/5HCl $ solution are mixed, the $ pH $ of resulting solution would be [RPMT 1997]

Options:

A) 0

B) 7

C) Less than 7

D) More than 7

Show Answer

Answer:

Correct Answer: B

Solution:

100 ml of $ \frac{M}{10} $ NaOH = 50ml of $ \frac{M}{5} $ NaOH.

They exactly neutralise 50 ml $ \frac{N}{5} $ HCl. Hence pH of resulting solution = 7.



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