Weak acids are usually one of the following: 1. hydrofluoric acid, , 2. acids in which the proton is not bonded to an oxygen atom or a halogen (ex. ), 3. where the number of oxygen atoms equals or only exceeds by the number of ionizable (ex. ) or 4. (ex. ).

1).  Weak acids are usually one of the following: 1. hydrofluoric acid, .

2). Acids in which the proton is not bonded to an oxygen atom or a halogen (ex. HCN ).

3). Oxo-acids where the number of oxygen atoms equals or only exceeds by 1 the number of ionizable protons (ex.) or

4). Carboxylic acids (ex. ).

Explanation:

Weak acids are the species which partially dissociate into ions when added to water. For example, acetic acid () is a weak acid.

Acids in which the proton is not bonded to an oxygen atom or a halogen is HCN.

Oxo-acids are the acids which contain oxygen atom. For example, , , R-COOh etc are all oxo-acids.

In oxo-acids, the number of oxygen atoms equals or only exceeds by 1 the number of ionizable protons.

Thus, we can conclude that:

1).  Weak acids are usually one of the following: 1. hydrofluoric acid, .

2). Acids in which the proton is not bonded to an oxygen atom or a halogen (ex. HCN ).

3). Oxo-acids where the number of oxygen atoms equals or only exceeds by 1 the number of ionizable protons (ex.) or 4. Carboxylic acids (ex. ).

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