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Version 573 – Exam 1 – Laude – (52390)1Thisprint-outshouldhave29questions.Multiple-choice questions may continue onthe next column or page – find all choicesbefore answering.0016.0 pointsWhat would be the pH of a solution of hypo-bromous acid (HOBr) prepared by dissolving9.7 grams of the acid in 20 mL of pure wa-ter (H2O)? The Ka of hypobromous acid is6.0 pointsRank following salts from most to least solu-ble:BiIKsp= 7.7×10−19Cd3(AsO4)2Ksp= 2.2×10−33AlPO4Ksp= 9.8×10−21CaSO4Ksp= 4.9×10−51.AlPO4<BiI<Cd3(AsO4)2<CaSO4correctMolar solubility can be approximated bytaking the nthroot of the Kspwhere n is thenumber of ions in the salt. Doing so results inapproximate molar solubilities of 10−10, 10−7,10−11and 10−3for bismuth iodide, cadmiumarsenate, aluminum phosphate and calciumsulfate, respectively.Arranging these fromleast to greatest produces:AlPO4<BiI<4.0036.0 pointsDetermine the molar solubility of calciumchloride (CaCl2) if1.9correct126.96.36.199.10.5
Version 573 – Exam 1 – Laude – (52390)20056.0 pointsConsider the following exothermic reaction:CaO(s) + CO2(g)←→CaCO3(s)In response to a decrease in temperature, thesystem would:0066.0 pointsConsider the reaction,Na+(aq) + Cl−(aq)←→NaCl(aq)The equilibrium constant,K, is 2.If theconcentrations of Na+, Cl−and NaCl are 2, 2and 10 M, respectively, which of the followingwould occur?