First slide

Concentration methods

Question

1 litre each of 0.2 M NaOH and 0.2 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

0.04
B

0.02
C

0.03
D

0.06

Solution

$N = \frac{V_{1} N_{2} + V_{2} N_{2}}{Total volume of the mixture}; N = \frac{1 (0.2) 1 + 1 (0.2) 2}{10}; N = 0.06 N; N_{base} = {[OH]}^{-}$

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