5. What is the pH of a 7.6 x
10
-4
M solution of the strong acid
HNO
3
?
Balanced equation:
HNO
3
(aq)
H
+
(aq) + NO
3
-
(aq)
What is the [H
+
]?
a)
[ H
+
] = C
a
= 7.6
x
10
-4
M
b)
[ H
+
] = 3 * C
a
= 2.28
x
10
-3
M
c)
[ H
+
] = [ OH
-
] = K
w
1/2
= 1.0
x
10
-7
M
d)
[ H
+
] cannot be determined
