A solution is 0.012 M in Pb(NO3)2 and 0.20 M in Sr(NO3)2. Solid Na2SO4 is added until a precipitate just begins to form. The precipitate is _________ and the concentration of sulfate ion at this point is ___________. Ksp for PbSO4 is 1.8 x 10–8 and for SrSO4 is 2.8 x 10–7. A) SrSO4; 2.6 x 10–7 M B) SrSO4; 8.3 x 10–7 M C) PbSO4; 6.3 x 10–6 M D) SrSO4; 1.4 x 10–6 M E) PbSO4; 1.5 x 10–6 M