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Topic: Help for dilutions  (Read 2811 times)

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Offline mra

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Help for dilutions
« on: January 24, 2016, 12:53:43 PM »
HI everyone
I have stock solution 0f 5M HCl how many ml should i take for it to make (i)0.005 moles of hcl in 2.5 ml and 0.005 moles in 5 ml.Please help me out with this
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Offline Hunter2

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Re: Help for dilutions
« Reply #1 on: January 24, 2016, 02:11:55 PM »
First Express 5 M. What does M means?
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Offline mra

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Re: Help for dilutions
« Reply #2 on: January 25, 2016, 09:01:40 AM »
5m is 5 molar
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Offline Hunter2

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Re: Help for dilutions
« Reply #3 on: January 25, 2016, 09:43:38 AM »
What does it mean in the right unit.
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Offline Arkcon

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Re: Help for dilutions
« Reply #4 on: January 25, 2016, 02:15:50 PM »
Please define for us molar, the definition will tell you what math to do.  Bit of trivia for you:  5 M is 5 molar.  But 5m is 5 molal, which is different.
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Hey, I'm not judging.  I just like to shoot straight.  I'm a man of science.

Offline mra

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Re: Help for dilutions
« Reply #5 on: January 26, 2016, 06:04:57 AM »
Its 5 moles/lit
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Offline Arkcon

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Re: Help for dilutions
« Reply #6 on: January 26, 2016, 06:53:19 AM »
Good.  You have 5 moles in 1 liter.  You want much less.  How will you do it?

Start with a simpler question.  Say you water 1 molar, that's just one fifth.  The math is the same.
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Hey, I'm not judging.  I just like to shoot straight.  I'm a man of science.

Offline Hunter2

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Re: Help for dilutions
« Reply #7 on: January 26, 2016, 07:38:11 AM »
Quote from: mra on January 26, 2016, 06:04:57 AM
Its 5 moles/lit

Yes , one hint convert this by factor 1000 to mol/ml. What happend to the 5 moles
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