3. 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)
Which equation do we use to calculate the
K
sp
?
a)
K
sp
= [ Cu
2+
][ N
3
-
]
b)
K
sp
= {K
w
} / {[ Cu
2+
][ N
3
-
]
2
}
c)
K
sp
= {[ Cu
2+
]} / {2 [ N
3
-
]}
d)
K
sp
= [ Cu
2+
][ N
3
-
]
2