You have 100 milliliters of a 0.50 M MgBr_{2} solution and dilute it to a total volume of 200 milliliters. What is the molarity of the resulting solution?

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Number of moles of solute remain constant.

Therefore, M1V1=M2V2

M2=M1V1/V2=100*0.5/200=0.25

Hence, Molarity of resulting solution is 0.25

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