Posted by **chi** on Monday, July 28, 2014 at 12:51pm.

Potassium 2:5 Chloride solution 30ml. How many milliliters of a potassium chloride 3:5 solution do you need to prepare the order?

- chemistry -
**DrBob222**, Monday, July 28, 2014 at 4:40pm
I asked earlier what you meant by a 2:5 and 3:5 solution and you didn't answer. I asked because there are several meanings to this. In my book a 2:5 solution is 40%(200/5) and a 3:5 solution is 60% (300/5).

So I use

c1v1 = c2v2

40*30 = 60*v2

v2 = 20

That is, add 20 mL of the 3:5 to a flask and add sufficient water to make 30 mL (10 mL) H2O to end up with 30 mL of 2:5 solution.

- chemistry -
**Anonymous**, Wednesday, November 16, 2016 at 2:20pm
so in other words DrBob, you dont know either

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