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  for Metal Finishing since 1989
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How to make some solutions

How to make the following solutions;

- 1N citric acid ⇦this on eBay or Amazon [affil links]
- 5 M Fe2(SO4)3
- 5 M Fe2(SO4)3,7H2O
- 100 ml of 1N HCl [1N HCl on Amazon [affil links]
- calculating M from spectrophotometer reading at A260

Shawn Mojarad
- Riverside, California, USA
2002

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First of two simultaneous responses --

Shawn,
Is this an actual lab need you have? If so, you'd have to tell us the starting point; in other words, what chemicals you have on hand. Like, do you want to make Fe2(SO4)3.7H2O out of Fe2(SO4)3 and water, or do you want to make it out of iron ore, sulfur, and air?

But I suspect you're just asking us to do your homework for you without giving us the benefit of the context of what chapter in your chemistry the questions appear in :-)

Ted Mooney, P.E.
Striving to live Aloha
finishing.com - Pine Beach, New Jersey
2002

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Second of two simultaneous responses --

Shawn, it sounds like you need to refresh your memory on what molarity and normality are with respect to solution concentrations. Also, the normality of the hydrochloric acid should be found on the container, so you dilute it from that.

Good luck!

Lee Gearhart
metallurgist - E. Aurora, New York
2002

Normality huh? I guess I'd better do some homework myself. This is a side issue but why have percentages and normalities? Why not stick to Moles and g per liter?

Ian Brooke
university - Glasgow, Scotland
2002

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Don't remember who said this, but the Normality is NOT written on the bottle of HCl; at least not the ones we get from FisherChemical. It should however, be in the package insert... but some foolish soul trashed ours. Thanks for any advice Kip

PS it is 36.5% HCl

Kip Arnold
health care - Dickson, Tennessee, USA
2004