posted by Maria .
you made up a standard solution of calcium sulfate (CaSO4). the temperature is 25C. you then add 5.00*10^-3 odium sulfate (Na2SO4). Calculate the concentrations of calcium and sulfate after equilibrium is reached? The pKs of CaSO4 is 4.58.
CaSO4 ==> Ca^+2 SO4^-2
Ksp = (Ca^+2)(SO4^-2) = 4.58E?? (you had better look up the Ksp because 4.58 can't possibly be correct.)
You then add 5.00*10^-3 WHAT of Na2SO4.
Take care of the errors in this and I'll get back to it.
the pKs is correct. If you 10 to the negative power of pKs you get the Ks. I'm having a problem witht this problem as well. Any help? And yes, you add 5*10^-3 of Na2SO4.