Homework Help: Chemistry-pls help urgent

Posted by candy on Tuesday, October 12, 2010 at 5:52pm.

Posted by candy on Tuesday, October 12, 2010 at 5:04pm.

1) How do I prepare 2M nitric acid from 65% concentrated nitric acid?

2) How do I prepare 17% ammonia from 25% concentrated ammonia?

Please show calculation steps. Thanks.

Chemistry -pls help urgent - DrBob222, Tuesday, October 12, 2010 at 5:33pm
Is that 65% and 17% w/w or w/v?
Do you have a density listed.

Chemistry -pls help urgent - candy, Tuesday, October 12, 2010 at 5:51pm
Assuming it is w/w as is the case for most acids and conc ammonia, can you show me the steps using 69% HNO3 and 28% ammonia?
I have density of 69% HNO3 as 1.42g/ml & 28% ammonia as 0.88g/ml.

Chemistry-pls help urgent - candy, Tuesday, October 12, 2010 at 5:55pm
this 17% ammonia is to dissolve my chloride ppt
Chemistry-pls help urgent - DrBob222, Tuesday, October 12, 2010 at 6:01pm
see your original post.
Chemistry-pls help urgent - candy, Tuesday, October 12, 2010 at 6:12pm
Hi, if I want to prepare a w/v solution, how do I prepare it? Thanks a lot.
Chemistry-pls help urgent - DrBob222, Tuesday, October 12, 2010 at 6:44pm
If it's the same 69% w/w with a density of 1.42, then we know it is 69g HNO3/100 g soln. 100 g soln has a volume of 70.4 mL so the solution is 69 g x 100/70.4 = 97.98 g/100 mL which I will round to 98 g/100 mL.
We want, say, 10% w/v.
10% w/v means 10 g HNO3/100 mL solution.
We have 98 g/100 mL so we want to take
100 mL x 10/98 = 10.2 mL of the concd solution and make to 100 mL final volume. Check my thinking.

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