if BaSo4 was precipitated in solution contain 0.012 M NaCl and 0.002 M BaCl2 .calculate the sulfate concentration which is sufficient for saturate the solution with BaSo4 , if you now that the Ksp for BaSo4 equal to 1*10^-10 .

Answer 1

BaSO4 ==> Ba^+2 + SO4^-2

Ksp = (Ba^+2)(SO4^-2) = 1E-10
Plug in 0.002M for (Ba^+2) [from the BaCl2] and solve for sulfate ion. This assumes you are not to make a correction for the activity coefficients and work with straight molarity. Otherwise you must calculate the activity coefficients and correct for molarities and Ksp.

Answer 2

ha ha doing the same problem right now