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Calcium sulfate is only sparingly soluble

CaSO4(s) ⇌ Ca2+(aq) + SO42-(aq)

For this type of

Question

Calcium sulfate is only sparingly soluble.

CaSO4(s) ⇌ Ca2+(aq) + SO42-(aq)

For this type of

dissolution reaction the equilibrium constant, also known as the solubility product, is denoted Ks.

In the reaction above, Ks = 4.9 x 10-6.

When an excess of the solid is dissolved in water what is the maximum concentration of Ca2+(aq) in mol L-1?

(Give your answer to at least TWO significant figures and do not include the units in the answer box. Hint: to help answer this question, first work out the mathematical equation for Ks in terms of the concentrations of the chemical species.)

Answer:

CaSoy (s )
2+
Initial
Ci
Calag) + 504 ( ag )
O
change
– S
+ S
+ S
Equilibrium
Ci -S
+ S
where squot; is
the motor solubility
For this reaction the solubility product is
of the sparingly…
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