First slide

Concentration methods

Question

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

Moderate

A

0.25
B

0.3
C

0.15
D

1

Solution

$V_{a} N_{a} = 2 (2) 1; V_{b} N_{b} = 1 (1) 1; V_{a} N_{a} > V_{b} N_{b}; N = {[H]}^{+} = \frac{V_{a} N_{a} - V_{b} N_{b}}{Total volume of the mixture}; N = {[H]}^{+} = \frac{2 (2) 1 - 1 (1) 1}{10} N = 0.3 N;$

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