1. Write a net ionic equation for the reaction that occurs when zinc sulfide and
ID: 891410 • Letter: 1
Question
1.
Write a net ionic equation for the reaction that occurs when zinc sulfide and excess hydroiodic acid are combined.
2. Determine the oxidation state for each of the elements below.
The oxidation state of
sulfur
in
sulfite ion
SO32-
is
.
The oxidation state of
sulfur
in
sulfur solid
S8
is
.
The oxidation state of
carbon
in
oxalic acid
H2C2O4
is
.
Use the pull-down boxes to specify states such as (aq) or (s).If a box is not needed leave it blank.
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Explanation / Answer
(1) ZnS (s) + HI (aq) -----------------------> ZnI2 (aq) + H2S (g)
(2)
(a)
oxidation state of S in SO3-2 = +4
explanation : x + (3 x -2 ) = -2
x = +4
(b) in S8 oxidation state of S = 0
(c) in C2H2O4 oxidation state of C = +3
explanation : 2x + 2 + 4 x -2 = 0
2x + 2 -8 = 0
2x = 6
x = +3
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