How to work out these concentrations
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How to work out these concentrations

[From: ] [author: ] [Date: 12-02-14] [Hit: ]
When provided with 2.0% Sodium chloride solution,0.0.0.0.......
This may be in wrong section but this is for a biology exam.

How would I go about answering this:

When provided with 2.0% Sodium chloride solution, how would you make 10cm3 of the following concentrations of Sodium chloride:

0.0%
0.3%
0.7%
0.9%
1.5%

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Approach the answer this way-
10 cm^3 of 0.9% NaCl contains0.09 g NaCl (10 x .009 = 0.09)
You want X cm^3 of 2% solution containing 0.09 g NaCl
X xm^3 of 2.0% NaCl contains 0.09 g NaCl (X * .02 = 0.09; X = 0.09/0.02 = 4.5)
4.5 cm^3 of 2.0% NaCl diluted to 10^3 with water yields 10 cm^3 of 0.9% NaCl

0 cm^3 diluted to 10 cm^3 --> 0.0%
1.5 cm^3 diluted to 10 cm^3 --> 0.3%
3.5 cm^3 diluted to 10 cm^3 --> 0.7%
4.5 cm^3 diluted to 10 cm^3 --> 0.9%
7.5 cm^3 diluted to 10 cm^3 --> 1.5%

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