<p>I was assigned to "Confirm the Ksp of Calcium sulphate as 7.05 x 10^-5"</p>
<p>I am to design the procedure and carry out an experiment which proves the Ksp of CaSO4.</p>
<p>I don't even know where to start, can you give me some clues?</p>
<p>Ksp = [Ca+2][SO4-2] = [x][x] = x^2 = 7.05 x 10^-5</p>
<p>x = 8.40 x 10^-3</p>
<p>If I remember correctly, that x represents the amount of calcium ion or sulphate that will dissociate in an aqueous solution. I'm not absolutely sure of an experiment to test this, but you probably have to use the solubility rules and come up with some compound that you could add to CaSO4 where, hopefully, the amount of precipitate is equal to x (you can use an I.C.E. table for determining this)...</p>
<p>thanks, I will start on that.</p>