For this problem, we’re being asked to calculate the solubility of CaF2 in 0.030 M NaF?
Since the compounds are ionic compounds, they form ions when dissociating in water. The dissociation of CaF2 and NaF in water are as follows:
The chloride ion, F–, has a charge of –1. Ca then has a charge of +2:
CaF2 (s) ⇌ Ca+(aq) + 2 F–(aq)
The chloride ion, F–, has a charge of –1. Na then has a charge of +1:
NaF (s) ⇌ Na+(aq) + F–(aq)
Calculate the F- concentration in 0.030 NaF.
= 0.030 M F-
What is the solubility of CaF2 (assume Ksp = 4.0 x 10-11 ) in 0.030 M NaF?
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