4. Calculate the solubility of
Cu(N
3
)
2
in water in grams per litre, where the
K
sp
= 6.3 x 10
-10
.
Equilibrium equation:
Cu(N
3
)
2
(s)
Cu
2+
(aq) + 2 N
3
-
(aq)
The goal is to use:
K
sp
= [ Cu
2+
][ N
3
-
]
2
to determine the concentration of
Cu(N
3
)
2
which can dissolve in aqueous solution.
If we let
[ Cu
2+
] = x
, what is
[ N
3
-
]
?
a)
2x
b)
4x
2
c)
x
d)
x
2