a. What is the precipitate which forms and then dissolves upon adding H_2 SO_2 t

Question

a. What is the precipitate which forms and then dissolves upon adding H_2 SO_2 to the mixture of K^+, [Al (H_2 O)_2 (OH)_4]^- and OH^-? b. Calculate the volume of 6.0 M sulfuric acid H_2 SO_4, solution required to neutralize the excess potassium hydroxide, KOH, solution from the first step of the synthesis. Indicate clearly your calculations and reasoning. c. Calculate the theoretical yield of the precipitate in a. Assume that you started with 1.00 g of Al(s) and could produce and collect the precipitate quantitatively. Indicate clearly your calculations and reasoning. d. Calculate the percent yield if you actually recovered 2.64 g of dried precipitate.

Explanation / Answer

part c

suppose if you start with 1 g Aluminium this means 1/27 moles= .037

this means .037 moles of reactant containing Aluminum

2 moles of KAL(OH)4 gives mole precipitate

so moles of precipitate= .037

so Mass of precipitate = .037*78=2.886 g of pecipitate = theoretical yield

part d

percentage recovery= (recovered mass/theoretical yield) * 100

percentage recovery = (2.64/2.86) * 100= 92.31 %

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