Thread: Chemistry: Finding the formula

Hi guys,
If anyone knows chemistry, can you please help me answer the question attached, the answer should be T3(PO4)2. which means that T has an oxidizing state of +2, but how do we get it?

thanks in advance

From the graph, you can see that the maximum amount of precipitate was obtained as soon as 8 millimol of phosphate was added into solution (8 ml of 1M solution = 8 millimoles). Adding any more phosphate doesn't change the amount of precipitate. The amount of T ion in the given solution is 12 millimol (= 12ml x 1M). So, the minimum amount needed to get all 12 mmol of T to precipitate is 8 mmol of phosphate. The ratio of T to PO4 is 3:2 giving the formula T3(PO4)2.


dm3 = L
mol/dm3 = mol/L = M
cm3 = ml

Source: Friend of girlfriend of DWSmith

Thanks Friend of girlfriend of DWSmith
really appreciate your help :-)