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Question

# How much water should be added to 750 mL of a 2.8 M HCl solution to make a 1.0 M resultant solution?

A
0.75 L
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B
1.25 L
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C
1.35 L
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D
1.00 L
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Solution

## The correct option is C 1.35 LM1V1=M2V2 M1 and M2 are the concentrations of the given solution and the resultant solution respectively and V1 and V2 are their respective volumes. M1=2.8 M,V1=750 mL;M2=1.0 M (2.8 M)×(750 mL)=(1.0 M)×V2 V2=(2.8 M)×(750 mL)(1.0 M) = 2100 mL = 2.1 L Volume of water to be added =2.1 L−0.75 L=1.35 L

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