Cliffs AP Chemistry, 3rd Edition

.

..

gHO

gH O

mol H O mol H O

1

0 694

18 02

(^21) 0 0385
2
#^2 = 2
.
.
.

. *
mol NiSO

mol H O NiSO H O

0 006500

0 0385

100

(^5936)
4
(^2) == 42 :
*NiSO 4 exists in two forms. The β-form is stable at 40°C and changes to the blue α-form
at room temperature. The α-form is an aquamarine to bluish-green color.

4. What was the percentage, by mass, of the water in the hydrate based upon this
   experiment?

%%water mass of hydrate

mass of H O in sample

=^2 # 100

. %%

.

g NiSO H O.

gH O

1 700 6 100 HO

0 694

40 8

42

2

: # =^2

5. What would be the theoretical percent of water in the hydrate and what was the percent
   error?

%%HOwhole mass .. %.%

part water

2 = #^100 ==^61802 262 87# #^100 41 1

%%exp ... %.%

exp

error

obs

= ## 100 =40 8 41 141 1- 100 =-0 7

6. What was the formula for the yellow anhydride produced?

NiSO 4

Part III: AP Chemistry Laboratory Experiments