Can you answer this question in chemistry about stoichiometric ratio and percentage yield? Thanks..?
Ca(OH)2. What is the stoich ratio bet the two cpds? What vol of Ca(OH)2 should be added for a complete reaction to occur? After decanting and washing, the student collected the precipitate and airdried it until the next day. The precipitate weighed 0.28 g. However he spilled the product and found that only 0.20 g was left. Calculate the % yield. Please answer this. Thanks..
Answer:
Al2(SO4)3 + 3Ca(OH)2 ---> 2Al(OH)3 + 3CaSO4
Al2(SO4)3 : Ca(OH)2 = 1:3
M1V1/(M2V2)= n1/n2
0.1M x V1/(0.2M x 10mL) = 3/1
V1 = 60mL
moles of Al(OH)3 = 2 x moles of Al2(SO4)3
= 2 x 0.2 M x 10/1000 L
= 0.004mol
theoretical mass of Al(OH)3 ppt = 0.004 mol x 78g/mol
=0.312g
% yield = actual mass produced / theoretical yield x 100%
= 0.28g/ 0.312g x 100%
=89.74%
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