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Author: Subject: calculating moler ratio of acids solutions?
Punk
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calculating moler ratio of acids solutions?

Is there a universal formula for figuring out how many moles of an acid are in a given solution?

I know that the hydrogen chloride molecule is 36.47g per mole but how many grams of 31.45% hcl solution does it take to equal 1 mole?
jack-sparrow
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you have to divide your needed mass of acid by its concentration:

36.47 g / 0.3145 = 116 g of solution

another example :

you need 0.5 mol of HBr but you only have 48% HBr solution

0.5 mol * 81 g/mol = 40.5 g
40.5 g / 0.48 = 84.4 g
density = 1.49 g/ mL
84.4 / 1.49 = 56.6 mL so you measure 56.6 mL or 84.4 g it is up to you.

Punk
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brain freeze

Im not sure what the needed mass of acid is untill i figure out how much ml. or g. 1 mole of 31.45% hcl acid is.

From there I can easily figure out the amount of 31.45% needed for a certain reaction.
Punk
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hmm

you need 1 mole of hcl but only have 31.45% solution

1 mol x 36.47 = 36.47

36.47/3.145 = 11.6g

So 11.6g of this 31.45% hcl solution is 1 mole correct?

[Edited on 10-8-2006 by Punk]
jack-sparrow
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I mole of HCl IS 36.5 g/mol so you divide 36.5 / 0.3145 to get :

116 g of HCl solution at 31.45 %

Punk
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I just needed to move my decimal.

Thanks

 Sciencemadness Discussion Board » Fundamentals » Beginnings » calculating moler ratio of acids solutions? Select A Forum Fundamentals   » Chemistry in General   » Organic Chemistry   » Reagents and Apparatus Acquisition   » Beginnings   » Responsible Practices   » Miscellaneous   » The Wiki Special topics   » Technochemistry   » Energetic Materials   » Biochemistry   » Radiochemistry   » Computational Models and Techniques   » Prepublication Non-chemistry   » Forum Matters   » Legal and Societal Issues