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### Topic: %(w/w) question  (Read 4612 times)

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#### MD2B

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##### %(w/w) question
« on: February 19, 2008, 09:06:11 PM »
This question has stumped me (organic is more of my thing); I'd appreciate any help that may be offered in figuring it out!
How many milliliters of concentrated nitric acid, 69% (w/w), with density of 1.409 g/mL are required to prepare 1 L of a 0.100 M Solution? Any insight will be helpful... thanks
« Last Edit: February 19, 2008, 09:43:56 PM by MD2B »

#### LQ43

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##### Re: %(w/w) question
« Reply #1 on: February 19, 2008, 09:29:36 PM »
First calculate Molarity of a 69% solution of HNO3

Key:  69 gm HNO3 /  100 g SOLUTION

How would you use the density?

decide which is more concentrated - the molarity of the 69% HNO3 or the 0.100 M solution

then use MconcVconc   =  Mdil Vdil

#### MD2B

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##### Re: %(w/w) question
« Reply #2 on: February 19, 2008, 11:04:18 PM »
Got it! thanks much, I just needed a little direction
Have a good evening everyone