Question

A 500.0 mL sample of saturated nickel(II) phosphate solution was analyzed spectrophotometrically and found
to contain 1.88 × 10-5 g of nickel.
(a) Determine the molarity of the nickel(II) phosphate solution.
(b) Calculate the solubility product constant, Ksp for nickel(II) phosphate
I'm assuming that the problem below (which I did in detail) will help you work this one.
a. 1.6
b.7.8*10^-6
The above answer is wrong.

a. 2.1*10^-7
b.4.85*106-32
these are correct

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