Concentration Problem
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Concentration Problem

[From: ] [author: ] [Date: 13-01-23] [Hit: ]
and 0.5 mL of Bleach, and are asked to calculate concentration (M) of Dye and Bleach.It seems really simple to me but I am just not sure at all how to calculate the concentrations, could anyone help?-Since you are using mL of liquids,......
So for a lab we have to do some pre-calculations, I can usually do them but this time I am stumped.

Stock Concentrations: 0.67M of Bleach, 0.00400M of Dye

We have 1.5 mL of water, 1.0 mL of a Dye, and 0.5 mL of Bleach, and are asked to calculate concentration (M) of Dye and Bleach.

It seems really simple to me but I am just not sure at all how to calculate the concentrations, could anyone help?

-
Since you are using mL of liquids, I will calculate mmoles (millimoles)

millimoles bleach = Molarity x mL bleach = (0.67)(0.5) = 0.34 mmoles bleach

New molarity bleach = mmoles bleach / total volume in mL = 0.34 / 3.0 = 0.11 M

millimoles dye = Molarity dye x mL dye = (0.00400)(1.0) = 0.00400 mmoles dye

New molarity dye = mmoles dye / mL of solution = 0.00400 / 3.0 = 0.0013 M
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