# CHEMISTRY

posted by Anonymous

Now given that the molar solubility of PbCrO4 (Pb2+ and CrO4 2-) is 1.40 x 10 -8 mol/L, find the Ksp

1. DrBob222

Write the expression for Ksp

Subtitute the numbers and solve.
Post your work if you gt stuck.

2. Vivian

How many kilograms of chalcopyrite needs to be mined to get 325g of pure Cu?

3. Anonymous

So my ksp expression is
Ksp=(Pb2+)^1(CrO4)^1
Ksp=(1.40 x 10^-8)^1(1.40 x 10^-8)^1
Ksp=1.96 x 10^-16
Is this right?

4. DrBob222

Yes, that's ight. You know, of course, that the exponents 1 are not needed; however, there is nothing wrong with putting them there AND it serves to remind you each time to place an exponent. Many of my students through the years forgot the exponent. Good work!

5. DrBob222

Don't piggy back your question on another question. Usually those get ignored. When you repost as a separate question, show the equation you want to use to go from chalcopyrite to Cu.

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