What mass of ZnS Ksp 25 1022 will dissolve in 3050 mL of0

What mass of ZnS ( Ksp 2.5 × 10-22 ) will dissolve in 305.0 mL of0.050 M 2- Mass = Visited Submit Answer Try Another Version 10 item attempts remaining

Solution

ZnS >> Zn + S
0 ..... 0.05 ...0
-x ...... 0.05+x ... x
Ksp = [Zn][S]
2.5x10^-22 = [.05+x][x]
assume x is small so
2.5x10^-22 = 0.05x
x = 50x10^-22 = 5x10^-21 M ZnS will dissolve
since you have 305 ml that would be 1.525x10^-21 moles
Molar mass of ZnS = 97.5 gm/mol
mass that will dissolve = 148.6875x10^-21 grams =1.5x10^-19 gms