A 50.0 mL sample of 1.50×10^−2 M Na2SO4(aq) is added to 50.0 mL of 1.28×10^−2 M Ca(NO3)2(aq). What percentage of the Ca^2+ remains unprecipitated? Express your answer using two significant figures.

Question

joannablackwelder · Answer

I'm supposed to do this without using a Ksp for CaSO4.

joannablackwelder · Answer

@Michele_Laino @Nnesha @Photon336 Any thoughts?

joannablackwelder · Answer

@TheSmartOne @rock_mit182 Any thoughts?

greatlife44 · Answer

maybe write the net ionic equation, eliminate the spectator ion, and use then use the Ksp.  equation.

joannablackwelder · Answer

Yeah, that's what I thought too, but I'm not allowed to use a Ksp for CaSO4

greatlife44 · Answer

oh, that changes everything.

joannablackwelder · Answer

Yeah...thanks though.

greatlife44 · Answer

totally forgot the solubility rules. But I don't get how this would be done without a Ksp I  figured you would need to know whether the solution is saturated or not.

greatlife44 · Answer

@aaronq