Which best describes what happens when 50 ml of 0.0010m cacl2 is added to 50 ml of 0.010m na2so4? (the ksp of caso4 = 2.4 × 10–5.)

For [Ca +2 ]:
0.0010 mol/l · 0.05 l =
For [ SO4 -2 ] :
0.01 mol/l · 0.05 l = 
Cumulative volume:
 50 ml + 50 ml = 10 ml = 0.1 l
[Ca +2 ] =
[SO4 - 2] = 
Qc for CaSO4:
Qc =  
This is less than Ksp of CaSO4. 
  C ) No precipitation will occur.

Answer is to avoid experimental error