For [Ca +2 ]:
0.0010 mol/l · 0.05 l = \(5 * 10^{-5} mol\)
For [ SO4 -2 ] :
0.01 mol/l · 0.05 l = \(5 * 10^{-4}\)
Cumulative volume:
50 ml + 50 ml = 10 ml = 0.1 l
[Ca +2 ] =\(\frac{5 * 10^{-5} }{0.1} = 5 * 10^{-4}\)
[SO4 - 2] = \(\frac{5*10^{-4} }{0.1}= 5* 10 ^{-3}\)
Qc for CaSO4:
Qc = \(5 * 10 ^{-4} * 5 * 10^{-3} = 25 * 10 ^{-7}= 2.5 * 10 ^{-6}\)
This is less than Ksp of CaSO4.
Answer: C ) No precipitation will occur.
