First slide

Concentration methods

Question

2 litres of 2 M HCl and 1 litre of 0.5 M NaOH are mixed with each other.The solution is diluted to ten litres. Proton concentration of the resultant mixture is ----- M

Moderate

A

0.25
B

0.12
C

0.1725
D

0.35

Solution

$V_{a} N_{a} = 2 (2) 1; V_{b} N_{b} = 1 (0.5) 1; V_{a} N_{a} > V_{b} N_{b}; N = {[H]}^{+} = \frac{V_{a} N_{a} - V_{b} N_{b}}{Total volume of the mixture}; N = {[H]}^{+} = \frac{2 (2) 1 - 1 (0.5) 1}{10} N = 0.35 N;$

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