Solvation Solution, Dilution

label Chemistry
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A laboratory investigation calls for 20 mL a 2.5 M solution of HCl, but the storeroom only has 10 M stock solution. How many milliliters of the concentrated stock must be used to create the diluted solution that is called for

May 29th, 2015
20 mL of 2.5 M sol'n = 0.020 L of 2.5 mol/L sol'n.
0.020 L * 2.5 mol/L = 0.05 moles HCl required.

We need to know the volume in mL of 10 M stock
which contains 0.05 moles.

1 L or 1000 mL of 10 M HCl contains 10 moles.

Now for the ratio so as to obtain the volume:

0.05 / 10 * 1000 mL = 5 mL stock sol'n.


May 29th, 2015

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May 29th, 2015

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