First slide

Concentration methods

Question

1 litre of 0.2 M NaOH and 2 litres 0.4 M Ba(OH)₂ are mixed with each other. The solution is diluted to ten litres. Hydroxyl ion concentration of the resultant mixture is ----- M

Moderate

A

0.09
B

0.6
C

0.18
D

0.5

Solution

$N = \frac{V_{1} N_{2} + V_{2} N_{2}}{Total volume of the mixture}; N = \frac{1 (0.2) 1 + 2 (0.4) 2}{10}; N = 0.18 N; N_{base} = {[OH]}^{-}$

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