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  4. The final molarity of a solution made by mixing 50 mL of 0.5 M HCl, 150 mL of 0.25 M HCl and water to make the volume 250 mL is

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Q. The final molarity of a solution made by mixing $50\, mL$ of $0.5\, M \,HCl,\, 150 \,mL$ of $0.25\, M\, HCl$ and water to make the volume $250\, mL$ is

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Solution:

$M_{1}V_{1} +M_{2}V_{2} = MV$
$ 0.5\times50+0.25\times150 = M\times250$
$ M=\frac{ 25+37.5}{250} = 0.25M$