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Question

2.5 litre of 1 M NaOH solution is mixed with another 3 litre of 0.5 M NaOH solution. Then find out molarity of resultant solution:

A
1.0 M
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B
0.73 M
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C
0.80 M
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D
0.50 M
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Solution

The correct option is B 0.73 MMolecular weight of NaOH=40 g mol−1 2.5 litre of 1 M NaOH solution contain 40×1×2.5 =40×2.5 g of NaOH 3 litre of 0.5 M NaOH solution contain 40×0.5×3 =40×0.5×3 g of NaOH If these two solutions are mixed, the volume of the resultant solution = (2.5 + 3) = 5.5 litre. 5.5 litre of the resultant solution contain =40(2.5+1.5) g of NaOH 1 litre of the resultant solution contain 40×45.5 g of NaOH=40×45.5×40 mole of NaOH The molarity of the resultant solution = 0.727 ≈ 0.73 M

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