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Topic: How many mL of 6M HNO3 must be added to 200mL of water to get 0.150M of HNO3?  (Read 2974 times)

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Offline Tyler-pH

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How many mL of 6M HNO3 must be added to 200mL of water to get 0.150M of HNO3?
« on: March 16, 2011, 08:36:53 PM »
I am in gchem 2 and someone from gchem 1 asked me this, but I couldn't figure out how to accommodate the water...

How many mL of 6M HNO3 must be added to 200mL of water to get 0.150M of HNO3?
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Offline Maplesyrup

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Re: How many mL of 6M HNO3 must be added to 200mL of water to get 0.150M of HNO3?
« Reply #1 on: March 16, 2011, 10:44:34 PM »
5ml of HNO3
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Offline rabolisk

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Re: How many mL of 6M HNO3 must be added to 200mL of water to get 0.150M of HNO3?
« Reply #2 on: March 17, 2011, 12:18:31 AM »
The answer is not exactly 5mL, although if you use proper significant figures, then it does round to 5 mL. It's a pretty simple dilution problem. What are you having trouble with?
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Offline Tyler-pH

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Re: How many mL of 6M HNO3 must be added to 200mL of water to get 0.150M of HNO3?
« Reply #3 on: March 17, 2011, 11:23:42 AM »
Thanks rabo. Yea I worked out 5mL, but the sig figs threw me for a loop. I don't think my brain wanted to allow .146 M to be rounded up to .150, so I made it more complicated than necessary.
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