The dissociation of ZnS and Zn(NO3)2 in water are as follows:
The sulfide ion, S2–, has a charge of –2. Zinc then has a charge of +2:
ZnS(s) ⇌ Zn2+(aq) + S2–(aq)
The nitrate ion, NO3–, has a charge of –1. Zinc then has a charge of +2:
Zn(NO3)2 → Zn2+(aq) + 2 NO3–(aq)
What mass of ZnS (K sp = 2.5 X 10 -22) will dissolve in 300.0 mL of 0.050 M Zn(NO 3)2? Ignore the basic properties of S 2-.
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