February 26, 2017

Homework Help: Chemistry help needed

Posted by tricia on Wednesday, December 17, 2008 at 9:43pm.

How do I prepare 90% formic acid from conc. formic acid (98%-100% of density 1.22g/ml)?

Please help me check if my calculations are correct.

Assuming conc. formic acid is 99%,

0.99 X 1.22 = 1.2078
Add 1.2078 / 9 = 0.1342ml H2O to 1ml of conc. acid to have a solution that is 90% formic acid by mass.

Let V be the volume of conc. formic acid needed.
0.1342V = 1000 – V
i.e. V = 881.7ml

Hence I will need to add 881.7ml of conc formic acid & make up to 1L with water?

Thank you.

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