- #1
Sunil Simha
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Homework Statement
This is a derivation of the relation between solubility of a salt and pH of the solution in which it is dissolved from our textbook.
Consider a salt MX whose Ksp=[M+][K-]
If this were dissolved in a solution of the acid HX whose Ka=[H+][X-]/[HX]
then what would be its solubility?
Now Ka/[H+]=[X-]/[HX]
or Ka/([H+]+ Ka)=[X-]/([HX]+[X-])=f say
It can be seen that f decreases as pH decreases.
If S were the solubility,
Then Ksp=(S)(f*S)
= S2(Ka+[H+])/Ka
Could anyone please explain how Ksp=(S)(f*S) because I have no idea.