It is common in laboratories to make concentrated “stock solutions” that may be

Question

It is common in laboratories to make concentrated “stock solutions” that may be used to prepare “working solutions” of any desired concentration. You are asked to dilute a stock of NaCl with a concentration of 0.5M.

a) Draw a dilution scheme to show how you might prepare 100mL of a solution of 25mM NaCl from the stock solution.

b) Draw a dilution scheme to show how you might prepare 100mL of a solution of 10mM NaCl from the stock solution.

c) Draw a dilution scheme to show how you might prepare 100mL of a solution of 0.1mM NaCl from the stock solution.

Please be sure to DRAW the answers, thanks!

Explanation / Answer

a. Dilute the stock solution 1:5 (that is, 1 plus 4) to make a 100 mM solution, then 1:5 again to make 20 mM.

b. Same as a, except one of the dilutions is 1:10 instead of 1:5

c. from b, dilute further by 1:10 and then 1:100.

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