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Home Q & A Board Science-Related Homework Help Chemistry (Moderator: Laser_3)
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ForgottenBlood ForgottenBlood
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8 years ago
To what volume should 5.0g of KCL be diluted in order to prepare a 0.25 M solution?

I got the set up, which is moles of solute/liter of solution...but i'm not sure what you do...

I did 39.0983+35.453=74.5513<-- Which is finding the molar mass

And I think dividing 5.0 by molar mass (I got .067 etc.) gave me the grams, but how do I find the volume?
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#1
Staff Member
8 years ago
in order to find molarity we know that M=mol/liter... so first convert the grams of kcl into moles:

5.0g KCl (1mol kCl/ 74.55g KCl) = 0.067mol of kCL (74.55g comes from the sum of the molecular weight of k and CL).

so we can now plug in this value into the formula to find volume:

M=mol/liter
liters= moles/M
= 0.067mol/ 0.25M
liters = 0.27 (remeber your sig. figs.)
Ask another question, I may be able to help!
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#2
8 years ago
 Change the grams of KCl to moles, Z.

Molarity = Moles / Liters

You need 0.25 Molarity, and we have Z moles. Thus, all that's left to find is Liters, denoted as L.

0.25 = Z / L

Solve for L, and that will be the liters necessary!
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