Calculate the molar solubility of leadthiocyanate in pure water. The molar solub

Question

Calculate the molar solubility of leadthiocyanate in pure water. The molar solubility is the maximumamount of lead thiocyanate the solution can hold. Express the molar solubilitynumerically. Part B Express the molar solubilitynumerically.

Explanation / Answer

To do Part B, we need to write down the equation: Pb(SCN)2--> Pb2+ + 2SCN- Since we have a KSCN solution you have some SCN already. Do the chart: Pb(SCN)2--> Pb2+ +2SCN- 0                      s           0.800-2s Ksp= [Pb2+][SCN-]2 Ksp=s[0.800-2s]2 (Note: you can ignore thechange because 0.8/Ksp > 400 Thus, Ksp=s[0.8]2 or simplyKsp=.64s 2.00 x10-5/0.64=s s=3.125 x 10-5 Hope this helps!

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