Question #190790

1) What is the solubility of PbI_{2} in g/l, if the solubility product is 7.9x10^{-9}

2) Cu(s)/ Cu+2 (0.02M) //Zn2+ (0.02M)/Zn(s); the standard reduction potential for Cu and Zn is 0.34 and -0.76 respectively. Calculate the standard cell potential, change in free energy and cell potential

Expert's answer

1.) Let the solubility of in 0.01M NaI solution be s M.

Then in this case,

And,

So,

Neglecting and terms, we get:

We get,

2.) In this part we can use the Nernst Equation,

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