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If solubility product of Zr 3 (PO 4 ) 4 is denoted by K sp and its molar solubility is denoted by S, then which of the following relation between S and K sp is correct ?

1. S = 7 / 1 sp 216 K ⎟ ⎟ ⎠ ⎞ ⎜ ⎜ ⎝ ⎛
2. S = 7 / 1 sp 6912 K ⎟ ⎟ ⎠ ⎞ ⎜ ⎜ ⎝ ⎛
3. S = 6 / 1 sp 144 K ⎟ ⎟ ⎠ ⎞ ⎜ ⎜ ⎝ ⎛
4. S = 9 / 1 sp 929 K ⎟ ⎟ ⎠ ⎞ ⎜ ⎜ ⎝ ⎛

Correct answer: S = 7 / 1 sp 6912 K ⎟ ⎟ ⎠ ⎞ ⎜ ⎜ ⎝ ⎛

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