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Topic: This molarity problem looks so simple!  (Read 4686 times)

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Offline Hunter2

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Re: This molarity problem looks so simple!
« Reply #15 on: November 28, 2012, 03:45:52 PM »
So you learned that 1 Cromium correspond to 1 Sodiumchromate

1 Cr ==> 1 Na2CrO4

Now calculate how much moles 75 ppm Cr is.

If you know this calculate back how much Sodiumchromate correspond to it.
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Offline Borek

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Re: This molarity problem looks so simple!
« Reply #16 on: November 28, 2012, 04:40:38 PM »
Quote from: dirknathan 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?

Not all, just Cr.

And the question I asked earlier was about chromium, not chromate. Does the presence of oxygen change the concentration of chromium? Once you will understand the question and the answer, you will see what it is all about.
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