# Limiting Reagents Essay

804 Words4 Pages
5.51: Which Reagent is limiting and How Much Precipitate is formed? SCH-3UI-03 David Yu Mrs. Hatton Due Date: May 5, 2012 Cut-Off Date: May 12, 2012 Purpose: To experience and use what you have learned in class about gravimetric stoichiometry by predicting and determining the mass of precipitate of two reactants and then comparing what you experience and what you calculated. Background: Avogadro’s constant is 6.02 x 1023 to find the number of entities. A mole is a useable amount of chemicals that is practical to use. The molar mass of a compound or atom is the mass of 1 mole of anything; this is relative to the atomic mass from the periodic table. The percentage yield from an experiment would be the actual yield divided by the theoretical yield multiplied by 100. We need to know how to balance chemical equations due to law of conservation of mass. Being able to turn moles into mass and mass into moles through the equation “m=nM” rearranged to find out other components. We need to be able to find the limiting reagent and be able to go through the process of gravimetric stoichiometry. Hypothesis: The limiting reagent will be the strontium chloride due to the calculations and the copper (II) sulphate pentahydrate. My calculations also conclude that we should get 1.378 g of the precipitate of Strontium Sulphate. SrCl2 * 6H2O + CuSO4 *5H2O SrSO4 + CuCl2+ 11H2O I Mole 1 Mole 1 Mole 1 Mole 11 Mole 2g 2g ? Materials: • 2 Graduated Cylinders • Distilled Water • Stirring Rod • Balance • One 250ml Beaker • One Erlenmeyer Flask • Filter Paper • Copper (II) Sulphate Pentahydrate • Strontium Chloride Hexahydrate Procedure 1. Two graduated cylinders are used and 75ml of distilled water are added to both 2. The two reactants are made into a solution by