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May 18, 2013

# Homework Help: Chemistry using concentration

Posted by Esmeralda on Monday, May 12, 2008 at 12:37am.

How many milliliters of 0.1256 M NaOH are required to provide 1.852 g of NaOH?

• Chemistry using concentration - DrBob222, Monday, May 12, 2008 at 12:46am

mols NaOH = grams/molar mass
Calculate mols NaOH needed.
Then M = mols/L
You have mols and M, calculate L.

• Chemistry using concentration - Esmeralda, Monday, May 12, 2008 at 12:47am

that makes no sense....better explanation please

• Chemistry using concentration - Esmeralda, Monday, May 12, 2008 at 12:52am

that makes no sense....better explanation please

• Chemistry using concentration - DrBob222, Monday, May 12, 2008 at 12:57am

Then you didn't read it very carefully. I'll draw you a picture.

mols NaOH = grams/molar mass
You have grams NaOH of 1.852. You can get molar mass NaOH. Calculate mols NaOH.

Calculate mols NaOH needed.The above does that calculation for you but you must plug in the numbers and punch the calculator.

Then M = mols/L
You have mols and M, calculate L.
The definition of molarity is mols/L.
You have mols from the first calculation. You have Molarity from the problem of 0.1256. The only unknown in M = mols/L is L. You must calculate that yourself.

• Chemistry using concentration - DrBob222, Monday, May 12, 2008 at 1:05am

There is a neat equation that I've always used but the modern teachers don't use it.
L x M x molar mass = grams.

• Chemistry using concentration - Derr, Monday, May 12, 2008 at 12:10pm

u sound like a doche bag

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