What kind of ion is contained in salts that produce an acidic solution?

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Solution

A salt dissolved in water can have a neutral, acidic or basic reaction, because of the ions by which it is formed. What is happening is called hydrolysis.

If the salt is made from strong acid and a strong base (for example $N a C l, K N O_{3}, L i_{2} S O_{4})$ hydrolysis doesn't happen and the reaction is neutral.

If the salt is made from weak acid and a strong base (for example $N a_{2} C O_{3}, K N O_{2}, L i_{2} S)$ it happens a basic hydrolysis or basic solution.

If the salt is made from strong acid and a weak base (for example $N H_{4} C l, A g N O_{2}, Z n S O_{4})$ it happens an acid hydrolysis or acidic solution.

If the salt is made from weak acid and a weak base (for example $M g C O_{3}, A g N O_{2}, (N H_{4})_{2} S)$ it happens an acid or basic hydrolysis , depending on the strength of the ions.

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