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Chemistry Question on Solutions

The final molarity of a solution made by mixing 50 mL50\, mL of 0.5 M HCl, 150 mL0.5\, M \,HCl,\, 150 \,mL of 0.25 M HCl0.25\, M\, HCl and water to make the volume 250 mL250\, mL is

A

0.5 M0.5\,M

B

1 M1\,M

C

0.75 M0.75\,M

D

0.25 M0.25\,M

Answer

0.25 M0.25\,M

Explanation

Solution

M1V1+M2V2=MVM_{1}V_{1} +M_{2}V_{2} = MV 0.5×50+0.25×150=M×250 0.5\times50+0.25\times150 = M\times250 M=25+37.5250=0.25M M=\frac{ 25+37.5}{250} = 0.25M