Stoichiometry Lab Mass-Mass

Purpose In this lab, you will determine the reaction for mixing two reactants together. In this lab, you will determine the reaction for mixing two reactants together. You will then measure out 1.09 Grams of Zinc Acetate, and dissolve, mix with H2O to make the solution. You will then measure out 1.09 Grams of Zinc Acetate, and dissolve, mix with H2O to make the solution. You will then measure out 1.35 Grams of Sodium Phosphate. You will dissolve, mix with H2O to make the solution. You will then measure out 1.35 Grams of Sodium Phosphate. You will dissolve, mix with H2O to make the solution. Will mix both solutions and record your observation in part D. Will mix both solutions and record your observation in part D.

Put on your safety goggles!

Obtain the reactants. Put the lid back on the bottle! Use a clean spatula from your box to dip into the chemical! Never touch lab chemicals with your hands! Put the lid back on the bottle! Use a clean spatula from your box to dip into the chemical! Never touch lab chemicals with your hands! Be sure to wait after you push the ZERO button until it reads g before you make a measurement (don’t hit CAL!) Be sure to wait after you push the ZERO button until it reads g before you make a measurement (don’t hit CAL!)

Obtain the reactants. You can either 1) zero the balance with the weighing paper, or 2) get a mass of the weighing paper and subtract.You can either 1) zero the balance with the weighing paper, or 2) get a mass of the weighing paper and subtract. Don’t waste time trying to get the exact amount needed… instead get close BUT WRITE DOWN THE ACTUAL AMOUNT!Don’t waste time trying to get the exact amount needed… instead get close BUT WRITE DOWN THE ACTUAL AMOUNT! Keep the balance and the desktop clean of lab chemicals! Clean up the SLIGHTEST spill with a paint brush and dispose of it properly!

Obtain the Zinc Acetate.

Dissolve the reactants in water. Dissolve the Zinc Acetate in a beaker with a specified amount of water. In another beaker, do the same with the Sodium Phosphate.

Filter the products. Follow the instructions above to fold the filter paper and insert into the funnel as shown. Follow the instructions above to fold the filter paper and insert into the funnel as shown. Slowly pour the mixture by filtering through a paper funnel. The liquid will pass through, but the solid will not. Slowly pour the mixture by filtering through a paper funnel. The liquid will pass through, but the solid will not. Be sure to get the mass of the filter paper BEFORE you filter! Be sure to get the mass of the filter paper BEFORE you filter!

Save your product and filtrate. Get rid of the liquid filtered into the flask or beaker. Get rid of the liquid filtered into the flask or beaker. Place the precipitate and filter paper into the drawer to dry overnight. Place the precipitate and filter paper into the drawer to dry overnight. Come back the next day and weigh the mass of the filter paper with the percipitate to answer part C. Come back the next day and weigh the mass of the filter paper with the percipitate to answer part C.

% error Experimental yield – Theoretical yield Theoretical yield Theoretical yield X 100 = % error What YOU got in the experiment What you predicted you would get (use stoichiometry)

% yield Experimental yield Experimental yield Theoretical yield Theoretical yield X 100 = % yield