Question

Will a precipitate form if 0.500 mol Manganese(2+) are added to one liter of a solution containing 0.010 mol of Sulfure(2-) ions? Just help me calculate the Q for this reaction, and I'll know whether it precipitates or not.

Answer 1

You can see it reacts in a 1:1 fashion as the manganese and sulfur charges are equivilant

so the product formed will be MnS

as for the amount you need to calculate the limiting reagent, because it reacts in a 1:1 ratio its clear that the sulfur is the limiting reagent as there is only 0.01 mol present to react with 0.5mol of Mn

therefore 0.01 mol of MnS will be formed, leaving 0.49mol of sulfur remaining in sollution.