Cliffs AP Chemistry, 3rd Edition

What was the percent sulfate ion in the alum based upon the experiment?

2.715 g paper + barium sulfate −1.675 g paper = 1.040 g BaSO 4 . .

g BaSO. g BaSO

mol BaSO mol BaSO

mol SO mol SO

gSO 1

1 040 233 37

1 1

(^1) 96 04
1
4
4
(^44)
4
4
4

2 = 0.4281 g SO 42 −

%% .

. sulfate whole % part g KAl SO H O

gSO 100 1 059 12

0 4281 100 2

4 42

# : = = #

2 - ^h = 40.43%

What would the theoretical % sulfate be in the alum?

.

. %.% g KAl SO H O

gSO 474 46 12

192 08 100 40 48 2

4 42 :

==#

2 - ^h

What was the % error in this investigation?

%%exp ... %.% exp error obs = ## 100 =40 43 40 4840 48- 100 =-0 15

Laboratory Experiments