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Calculation error help!

Posted: Mon Jul 03, 2017 4:15 pm
by Tara 1F
A solution is prepared by dissolving 55.1g of KCl in approx 75mL water and then adding water to a final volume of 125mL. What is the molarity of Kcl (aq) in this solution?

Re: Calculation error help!

Posted: Wed Jul 05, 2017 10:28 am
by Chem_Mod
The 75 mL is not important; it determines an intermediate concentration. Convert the grams of KCl to moles and divide by the final volume.

Re: Calculation error help!

Posted: Sun Oct 07, 2018 11:22 pm
by Yixiao Hu 3C
you should use the formula n=m/M for the moles of kcl; and then you should use the formula molarity=n/v . the first 75ml here is just useless. you only need the final volume.