For each of the salts on the left, match the salts on the right that can be comp

Question

For each of the salts on the left, match the salts on the right that can be compared directly, using Ksp values, to estimate solubilities.

(If more than one salt on the right can be directly compared, include all the relevant salts by writing your answer as a string of characters without punctuation, e.g, ABC.)

Write the expression for K in terms of the solubility, s, for each salt, when dissolved in water.

manganese(II) sulfide

calcium phosphate

Ksp =

Ksp =

Note: Multiply out any number and put it first in the Ksp expression. Combine all exponents for s.

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Without doing any calculations (just compare the correct Ksp values) complete the following statements:

1. manganese(II) sulfide ___ A. BaCO3 2. calcium phosphate ___ B. Ca(OH)2 C. Fe2S3 D. Zn(OH)2

Explanation / Answer

Expression of solubility product of MnS

MnS <==> Mn2+ +S2-

so Ksp = [Mn2+][S2-]

Ksp = s2 if the molar solubitily of MnS be s mol/L.

Similarly for Calcium phosphate,

Ca3(PO4)2 <==> 3 Ca2+ + 2 PO43-

so Ksp = [3* Ca2+]2[2*PO43-]3

Ksp = 72s5 if the molar solubitily of MnS be s mol/L

Ksp of Magnesium fluoride is 5.16 x 10-11

,, ,, Lead Fluoride is 3.3 x 10-8

,, ,, Feric hydroxode is 2.79 x 10-39

,, ,, Silver sulfide is 8 x 10-51

,, ,,   Aluminium hydroxide is 3x10-34

So clearly, magnesium fluoride is MORE soluble than BCD

magnesium fluoride is LESS soluble than A

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