Stoichiometry of a Precipitation Reaction Lab Report

690 Words3 Pages
Stoichiometry of a Precipitation Reaction October 1, 2013 Chem 131A-011 Partner: Purpose: This lab exercise combines the study of a precipitation reaction with stoichiometry. The amount of product produced in the precipitation reaction will be predicted to determine the theoretical yield. The reactants and products will be measured to determine the actual yield and the percent yield. Procedure: * 1.0 g of CaCl2·2H2O was put in a 100-mL beaker. * 25 mL of distilled water was stirred in to form the calcium chloride solution. * Stoichiometry was used to determine how much Na2CO3 was needed for a full reaction. 1.0g CaCl2·2H2O(1mol CaCl2·2H2O/147g CaCl2·2H2O)(1mol Na2CO3/1mol CaCl2·2H2O)(106g Na2CO3/1mol Na2CO3)=0.72g Na2CO3 * The 0.7g of Na2CO3 was weighed and put in a small cup. * 25ml of distilled water was stirred in to make a sodium carbonate solution. * The sodium carbonate solution was poured into the beaker with the calcium chloride solution. * A sheet of filter paper was folded in half twice and weighed. (1.1g)/(0.7g) * The filter paper was placed in a funnel in a paper cup. * The contents of the beaker were swirled to dislodge any participate from the sides and then slowly poured through the funnel. * 5ml of distilled water was poured down the sides of the beaker, swirled and poured into the funnel. * The filter paper containing the precipitate was allowed to dry and then weighed. 1.7g/1.4g * The weight of the filter paper was subtracted (1.1g/0.7g) to give the actual yield of calcium carbonate (0.6g/0.7g). Observations: * When CaCl2 and Na2CO3 were mixed, a white precipitate was noted immediately. * Residual precipitate was observed on the beaker when filtering. * The filter paper with the precipitate took two days to dry. Experiment 1: Theoretical yield: 0.7

More about Stoichiometry of a Precipitation Reaction Lab Report

Open Document