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Question

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

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

The correct option is C 0.73 M
Given,
2.5L 1M NaOH mixed with 3L 0.5M NaOH

Initially, Number of moles in 2.5L, 1M NaOH=2.5×1=2.5moles

Number of moles in 3L, 0.5M NaOH=3×0.5=1.5 moles
Total number of moles in final mixture=2.5+1.5=4.0 moles

The total volume of solution=2.5+3=5.5L

Molarity of final solution=4moles5.5L

=0.728M0.73M.

Hence, the correct option is C

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