Altius Test 3 Q 7 Section 1

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fhussain9

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Can someone plz further explain this quesiton??? I don't understand their explanation...

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CaF2 partially dissolves into Ca2+ and 2F-.

CaSiO3 partially dissolves into Ca2+ and SiO3, but there's already some Ca2+ in solution, which prevents as much of this from dissolving. SiO3 dissolves with Ca2+ in this way in a 1:1 manner, but since there's already some Ca2+ in solution, [Ca2+] > [SiO3].
 
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