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Topic: CALCULATING MASS THAT WILL DISSOLVE IN 100 mL OF WATER!!  (Read 6551 times)

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Offline bblue

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CALCULATING MASS THAT WILL DISSOLVE IN 100 mL OF WATER!!
« on: May 30, 2009, 03:05:51 PM »
Calculate the mass of Ag2CrO4 (Ksp = 9.00×10-12) which will dissolve in 100 ml of water.

My work:
i calculated the concentration to be 1.31037E-4 M
then i calculated g/100mL [and im not sure if these are the units im suppose to look for]
1.31037E-4 M * .1 L * 331.7296 g = .00435 g/100mL

But this is WRONG...
can someone please tell me what units i should be using
THANK YOU!!  :)
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Offline Train

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Re: CALCULATING MASS THAT WILL DISSOLVE IN 100 mL OF WATER!!
« Reply #1 on: May 30, 2009, 11:12:36 PM »
Quote from: bblue on May 30, 2009, 03:05:51 PM
Calculate the mass of Ag2CrO4 (Ksp = 9.00×10-12) which will dissolve in 100 ml of water.

Are you sure that's the correct value of Ksp?  My textbook has 1.2×10-12 and the CRC has 1.1×10-12.
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Offline bblue

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Re: CALCULATING MASS THAT WILL DISSOLVE IN 100 mL OF WATER!!
« Reply #2 on: May 31, 2009, 12:10:54 AM »
i have also checked the ksp in other sources, but that is the ksp that i was given in the qn so that is the ksp i have to use
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Offline bblue

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Re: CALCULATING MASS THAT WILL DISSOLVE IN 100 mL OF WATER!!
« Reply #3 on: May 31, 2009, 10:04:37 PM »
i figured out the ans
the ans i gave was correct
i just had to enter my ans as g not g/100mL
but thanx anyways :)
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