Equal volumes of 0.002 m solution of sodium iodate

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Question 7.69 Equal volumes of 0.002 M solutions of sodium iodate and cupric chlorate are mixed together. Will it lead to precipitation of copper iodate? (For cupric iodate Ksp = 7.4 × 10^(–8)).

Class XI Equilibrium Page 230

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2NaIO3 + Cu(ClO3)2 ----> 2NaClO3 + Cu(IO3)2

equal volume of 0.002M solutions of NaIO3 and Cu(IO3)2 are mixed together. So, molar concentration of each species will be halved.
so, conc. Of each = 0.002M/2 = 0.001 M
e.g., [Cu2+]mix = [IO3-]mix = 0.001 M

now, Cu(IO3)2 <=> Cu2+ +2IO3-
solubility product {Ksp} = [Cu2+][IO3]²
for precipitation, ionic product > Ksp
e.g., [Cu2+][IO3]² > Ksp
But here,
0.001 × 0.001 = 10^-9 < 7.4 × 10^-8
it is less than Ksp. hence, there won't be precipitation.

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