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This molarity problem looks so simple!
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Topic: This molarity problem looks so simple! (Read 4718 times)
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dirknathan
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This molarity problem looks so simple!
«
on:
November 27, 2012, 03:27:44 PM »
Yet, I can't see the silver lining.
In a routine analysis a solution of sodium chromate with a chromium concentration of 75.0 ppm is required. Calculate the molarity of the solution.
Now, does ppm equal mg/L?
Thanks for the *delete me*
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Borek
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Re: This molarity problem looks so simple!
«
Reply #1 on:
November 27, 2012, 03:30:18 PM »
Quote from: dirknathan on November 27, 2012, 03:27:44 PM
Now, does ppm equal mg/L?
Usually yes.
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ChemBuddy
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dirknathan
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Re: This molarity problem looks so simple!
«
Reply #2 on:
November 27, 2012, 04:36:49 PM »
Well, is it relevant to this problem?
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Hunter2
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Re: This molarity problem looks so simple!
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Reply #3 on:
November 27, 2012, 05:05:44 PM »
Yes it is.
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dirknathan
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Re: This molarity problem looks so simple!
«
Reply #4 on:
November 27, 2012, 06:09:00 PM »
How do I relate the Sodium to that of mg/L?
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Borek
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Re: This molarity problem looks so simple!
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Reply #5 on:
November 27, 2012, 06:35:11 PM »
Through the molar masses. What molar concentration of sodium chromate has 75 mg Cr per liter?
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ChemBuddy
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dirknathan
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Re: This molarity problem looks so simple!
«
Reply #6 on:
November 28, 2012, 12:28:21 AM »
I've figured out the molarity of Cr. how does one find the molarity of the entire solution with the molarity of one part?
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Hunter2
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Re: This molarity problem looks so simple!
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Reply #7 on:
November 28, 2012, 12:42:15 AM »
Mole is the base. How many Chromium atoms you have in one molecule Chromate? If you know the mole of Chromium then you also know it from the Chromate then.
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dirknathan
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Re: This molarity problem looks so simple!
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Reply #8 on:
November 28, 2012, 11:51:01 AM »
What about the oxygena in Chromate?
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Borek
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Re: This molarity problem looks so simple!
«
Reply #9 on:
November 28, 2012, 01:40:30 PM »
Does the presence of oxygen change the concentration of chromium?
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ChemBuddy
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dirknathan
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Re: This molarity problem looks so simple!
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Reply #10 on:
November 28, 2012, 01:54:14 PM »
Chromate*
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Hunter2
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Re: This molarity problem looks so simple!
«
Reply #11 on:
November 28, 2012, 01:58:35 PM »
What is the formula of sodium chromate.
If you know this 1 mole of it containd how many mole sodium, chromium and oxygen.
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dirknathan
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Re: This molarity problem looks so simple!
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Reply #12 on:
November 28, 2012, 02:28:18 PM »
Na
2
CrO
4
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Hunter2
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Re: This molarity problem looks so simple!
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Reply #13 on:
November 28, 2012, 02:31:08 PM »
Great.
If you have 1 mol of sodium chromate, how many moles of sodium it contains, the same for chromium and oxygen.
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dirknathan
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Re: This molarity problem looks so simple!
«
Reply #14 on:
November 28, 2012, 02:52:10 PM »
So two moles of Na, 1 of Cr and 4 of O? Now do they all have 75 ppm?
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This molarity problem looks so simple!