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Solubility Product

Ca 3PO 4 2...

Question

Ca $_{3}$ (PO $_{4}$ ) $_{2}$ (s) $⇋$ 3Ca $^{2 +}$ (aq) + 2 PO $_{4}^{3 -}$ (aq)
Find the equilibrium expression for the dissolution of $C a_{3} (P O_{4})_{2}$ ?

_{s p}

= [Ca

^{2 +}

]

^{3}

[PO

_{4}^{3 -}

]

^{2}

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_{s p}

= [Ca

^{2 +}

]

^{2}

[PO

_{4}^{3 -}

]

^{3}

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_{s p}

= [Ca

^{2 +}

][PO

_{4}^{3 -}

]/[Ca

_{3}

(PO

_{4}

)

_{2}

]

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_{s p}

= [Ca

^{2 +}

]

^{3}

[PO

_{4}^{3 -}

]

^{2}

/[Ca

_{3}

(PO

_{4}

)

_{2}

]

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_{s p}

= [Ca

^{2 +}

]

^{2}

[PO

_{4}^{3 -}

]

^{3}

/[Ca

_{3}

(PO

_{4}

)

_{2}

]

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Solution

The correct option is B K $_{s p}$ = [Ca $^{2 +}$ ] $^{3}$ [PO $_{4}^{3 -}$ ] $^{2}$
${C a}_{3} {(P O_{4})}_{2} (s) = 3 {C a}^{2 +} (a q) + 2 {P O}_{4}^{3 -} (a q)$

$K e q = \frac{{[{C a}^{2 +}]}^{3} {[{P O}_{4}^{3 -}]}^{2}}{[{C a}_{3} {({P O}_{4})}_{2}]}$

$∴ K s p = {[{C a}^{2 +}]}^{3} {[{P O}_{4}^{3 -}]}^{2}$
$[C a_{3} (P O_{4})_{2}]$ is in solid state so it will be taken as $1$ .

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Similar questions

What is the correct equilibrium expression (K_sp) for the reaction below:
Ca₃(PO₄)_2(s) ⇌ 3Ca²⁺_(aq) + 2PO₄^2-_(aq)

Solve this equation H3Po4+3Ca(OH2)=HOH+Ca3(Po4)

Solve this equation H3(Po4)+Ca(OH2)=HOH+Ca3(Po4) I want this method of balance

H_{3} {P O}_{4}

is a tribasic acid, it undergoes ionization as:

H_{3} {P O}_{4} ⇋ H^{+} + H_{2} {P O}_{4}^{-}; K_{1}

H_{2} {P O}_{4}^{-} ⇌ H^{+} + H {P O}_{4}^{2 -}; K_{2}

H {P O}_{4}^{2 -} ⇌ H^{+} + {P O}_{4}^{3 -}; K_{3}

Then, equilibrium constant for the following reaction will be:

H_{3} {P O}_{4} ⇌ 3 H^{+} + {P O}_{4}^{3 -}

Q. In the reaction-

H_{3} {P O}_{4} + C a {(O H)}_{2} \to C a H {P O}_{4} + 2 H_{2} O

the equivalent of phosphoric acid is-

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Ca3(PO4)2(s) ⇋ 3Ca2+(aq) + 2 PO3−4(aq)Find the equilibrium expression for the dissolution of Ca3(PO4)2?

The correct option is B Ksp = [Ca2+]3[PO3−4]2Ca3(PO4)2(s)=3Ca2+(aq)+2PO3−4(aq)Keq=[Ca2+]3[PO3−4]2[Ca3(PO4)2]∴Ksp=[Ca2+]3[PO3−4]2[Ca3(PO4)2] is in solid state so it will be taken as 1.

Ca $_{3}$ (PO $_{4}$ ) $_{2}$ (s) $⇋$ 3Ca $^{2 +}$ (aq) + 2 PO $_{4}^{3 -}$ (aq)
Find the equilibrium expression for the dissolution of $C a_{3} (P O_{4})_{2}$ ?