Homework Help: chemistry

Posted by j on Monday, October 4, 2010 at 1:39am.

You need to prepare 500.00 mL of a 0.25 M solution of nitric acid . Concentrated nitric acid comes from the chemical copmanies as a 15.8 M liquid. How much (in mL) of this 15.8 M solution will you need to dilute to 500.00 mL to get the desired 0.25 M solution?

chemistry - Dr Russ, Monday, October 4, 2010 at 4:11am
The question as posed makes little sense in terms of significant figures and practicalities. You would not use glassware of 500.00 ml +/- 0.01 ml (5 sig figs) to prepare a solution of 0.25 M (2 sig figs). Incidently a standard 500 ml class A volumetric glassware has an accuracy of +/- 0.15 ml.

I digress...
to get 500 ml of a 0.25 M solution you need 0.125 mole of nitric acid made up to 500 ml total volume.

To find the volume (in ml) of nitric acid needed we can do this by simple proportion.

15.8 mole in 1000 ml

so

1.00 mole in 1000 ml/15.8

and

0.125 mole in 1000 x 0.125 ml/15.8

which you only need to quote to 2 sig figs

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