HIn
+ H
2
O
H
3
O
+
+
In
-
Acid-base indicators
are
weak acids or bases
.
The molecular form has a different color
than the ionic form.
HIn
+ H
2
O
H
3
O
+
+
In
-
HIn
+
H
2
O
H
3
O
+
+
In
-
Increase the concentration of H
3
O
+
HIn
+ H
2
O
H
3
O
+
+
In
-
HIn
+ H
2
O
H
3
O
+
+
In
-
Decrease the concentration of H
3
O
+
Or