Acids And Bases Worksheet - Michalek, Unit 14 Page 5
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27AP Chemsitry--Michalek
5
Unit 14 Acids and Bases
Water as an acid and a base
Amphoteric—act as an acid or a base
Water is the most common amphoteric substance.
+
-
Autoionization of water 2H
O ↔ H
O
+ OH
2
3
+
-
-14
K
= [H
O
] [OH
] = 1.0 x 10
w
3
When an acid reacts with water, the water behaves as a proton acceptor to form the hydronium ion.
When a base (like ammonia) reacts with water, a proton is transferred from water to the ammonia molecule to form the
ammonium ion. Therefore, water is behaving as a proton donor.
+
-
1. Nuetral Solution--[H
O
]= [OH
]
3
+
-
2. Acidic Solution--[H
O
]> [OH
]
3
+
-
3. Basic Solution--[H
O
]< [OH
]
3
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