Posted by **Yue** on Tuesday, May 13, 2014 at 8:36pm.

How many mL of concentrated HCl would be required to make 200mL of a 4M solution? Specific gravity = 1.2, assay = 40%

- Chemistry -
**DrBob222**, Tuesday, May 13, 2014 at 8:52pm
I would first convert 40% HCl into molarity.

40% (I guess that's w/w) HCl means 40g HCl/100 g solution.

40g/36.5 = approx 1.10 mols HCl

mass = volume x density so volume = mass/density. That 100 g soln = 100/1.2 = approx 80 mL or 0.08 L; therefore, the molarity is 1.1/0.08L = about 14 M but you need to go through and redo all of these numbers more accurately.

Then use the dilution formula of

mL1 x M1 = mL2 x M2.

200 x 4 = mL2 x 14

Solve for mL2.

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