<p>Stoichiometry Lab</p><p>Objective: find out if iron III sulfate is formed or iron II sulfate is formed in this experiment</p><p>Prelab </p><p>You will use 3.5g of copper II sulfate and 1 g of iron filings in this lab</p><p>CuSO4 + Fe  Cu + FeSO4</p><p>3CuSO4 + 2Fe  3Cu + Fe2(SO4)3</p><p>1.Calculate the mass of Cu expected if iron III sulfate is formed- find the limiting reactant 1. turn 3.5g of copper sulfate into copper 2. turn 1 g of iron into copper determine which reactant runs out first</p><p>2.Calculate the mass of Cu expected if iron II sulfate is formed- find the limited reactant 1. turn 3.5g of copper sulfate into copper 2. turn 1 g of iron into copper determine which reactant runs out first 3.What color is a copper II sulfate solution? Procedure 1.Place 3.5 g copper Ii sulfate in a 250ml beaker 2.Add 25ml of water 3.warm on the hot plate while stirring NOT BUT NOT BOILING 4.After all of the crystals have dissolved, remove the beaker from the heat 5.Add 1g of iron filings SLOWLY to the HOT copper sulfate solution while stirring 6.Allow the beaker to cool for 10-15minutes 7.Pour off the solution into a different beaker down the stirring rod(this is called decanting) 8.TRY NOT TO DISTURB THE COPPER 9.add 10ml of water to the copper and stir 10.get the mass of a filter paper 11.filter the copper solution into another beaker 12.allow the copper to dry until next lab period</p><p>Observations each part of the experiment Date Mass filter paper______Mass filter paper and dried copper______Mass of copper______</p><p>Conclusion 1.What is some evidence that a chemical reaction took place? Examples-color change or new product formed</p><p>2.What is the mass of copper formed?</p><p>3.From your observation, which reactant is probably limiting AND why do you know?</p><p>Iron is limiting because solution remained light blue after the reaction was completed-there was not iron filings left over in the solution</p><p>4.Using your prelab calculations and your observation, what is the formula for your iron II or III sulfate?</p><p>Since the iron is limiting iron II sulfate by the mass of copper produced in relation to the prelab calculations and by the fact that the iron was limiting when that compound was used in the calculations</p>