Calculate the minimum concentration of Cr3+ that must be added to 0.095 M NaF in order to initiate a precipitate of chromium(III) fluoride. (For CrF3 , Ksp = 6.6 * 10-11.)
A) 0.023 M
B) 0.032 M
C) 7.7 * 10-8 M
D) 2.9 * 10-9 M
E) 6.9 * 10-10 M
Correct Answer:
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