Hydrochloric acid is classified as a strong acid, ionizing almost completely in water.

Dilute hydrochloric acid is the acid in the human stomach which helps in the digestion of food.

Nitric acid is classified as a strong acid, ionizing almost completely in water.

Acetic acid is classified as a weak acid since it ionizes weakly in water. Common vinegar is 5% acetic acid and 95% water.

Sulfuric acid is classified as a strong acid, ionizing almost completely in water.

Sulfuric acid is the most abundant product of the chemical industry. It is used in the refining of metals and in the manufacture of a wide variety of substances. It is used for the "pickling" of steel to retard corrosion, in the refinement of petroleum, and in the manufacture of fertilizers.

Citric acid, found in citrus fruits, is classified as a weak acid since it ionizes weakly in water.

Carbonic acid is classified as a weak acid since it ionizes weakly in water. It is found in soft drinks.

Phosphoric acid is classified as a weak acid since it ionizes weakly in water. Phosphoric acid is found in soft drinks. In more concentrated solutions, it is used for rust removal and for the preparation of steel surfaces for painting.

Oxalic acid is classified as a weak acid since it ionizes weakly in water. It is found in rhubarb and is partly responsible for the tart taste. Oxalic acid is used in preparations for the flushing out of automobile cooling systems since it is effective in removing corrosion.

Cream of tartar is classified as a weak acid since it ionizes weakly in water. It is a component of baking powder along with sodium bicarbonate.