KEY to PRELAB 347: Preparation of Strontium Iodate Monohydrate 1. You should always wash your hands thoroughly with soap before leaving a laboratory to reduce the possibility of ingesting any of the chemicals or skin and/or eye irritation. 2. a. precipitate - the solid that is formed during a chemical reaction. It generally settles to the bottom of the reaction container. b. supernate - the solution that is above a precipitate in a reaction mixture. c. limiting reagent - the reactant that is used completely in a reaction. d. theoretical yield - the maximum amount of product that could be formed, based on the limiting reagent and the stoichiometry of the reaction. e. percent yield - an expression of the efficiency of a reaction. It is calculated by comparing the actual and theoretical yields. 3. a. Pb(NO 3 ) 2 (aq) + 2 NaI (aq) PbI 2 (s) + 2 NaNO 3 (aq) b. 5.000 x 10-3 moles of both lead (II) nitrate and sodium nitrate were added, but, because of the 2:1 ratio for sodium iodide:lead (II) nitrate, all of the sodium nitrate reacted whereas only
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