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Acid salt is a chemical compound, formed when a dibasic or tribasic acid was neutralized to some degree. Despite being a salt, the replaceable hydrogen remains. It acts like an acid, because when the acid salt is ionised, it yields a H+ ion which demonstrates the acidic properties.
Examples of acid salts include: sodium hydrogen sulfate (NaHSO4), sodium hydrogen carbonate (NaHCO3), sodium hydrogen sulfide (NaHS), phosphatase (a class of enzymes).
Common low-temperature acid salts include cream of tartar, calcium phosphate, and citrate. High-temperature acid salts are usually aluminium salts, such as calcium aluminum phosphate. They can be found in many baking powders, also in many non-dairy coffee creamers.
Preparing an acid salt
In preparing sodium sulfate, a normal salt, a certain amount of sodium hydroxide is needed to neutralize the sulfuric acid to produce this salt. When preparing sodium hydrogen sulfate, and acid salt, half of the required amount of sodium hydroxide for neutralization is used.
See Also
Acids when combined with Bases or Alkaline materials usually produce regular (pH neutral) Salts. The base equivalent of an acid salt is an Alkali salt. Where acid salts are weak acids alkali salts are weak bases.
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