Angelica J.

asked • 03/09/16

CHEM 2 Solubility Equilibrium Question?? PLEASE HELP!?

Hi everyone. I have two questions that I think I found the answer to, but could you check and see if they are right? If they are incorrect, could you show me how you achieved the correct answer? Thank you!

1. Calculate the molar solubility of CaCO3 in 0.0025M Ca(NO3)2 solution, Kip of CaCO3 = 3.2 x 10^-9. 
     I found the molar solubility to be 1.3 x 10^-7
 
2. Determine if a precipitate will form in a solution containing 0.33 M Co+2 and 3.33 x 10^-4 M OH-. Kip of Co(OH)2 = 2.0 x 10^-16. 
 
This is a stretch, because I kind of guessed, but I calculated Q to be 3.66 x 110^-8, and since this value was greater than Ksp, I said a precipitate would form.
 
Bonus question - How many sigfigs should these answers be??
 

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