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Alkali salt

physical science Maturity 11-13 Next article →

Some salts act like a base. We call these alkali salts or base salts. Most salts are neutral and do not change the water they sit in. Alkali salts are different because they make a solution basic. This happens when they mix with a liquid. They are the result of a strong base meeting a weak acid. This meeting is not complete. Because of this, the salt keeps some basic qualities.

How do these salts work? It all comes down to a thing called hydrolysis. This is when a substance changes in water. In an alkali salt, a part from the weak acid undergoes hydrolysis. This part is called a conjugate base. When it reacts with water, it creates a basic solution. For example, look at sodium carbonate. It comes from carbonic acid. The carbonate part undergoes hydrolysis to make the water basic.

Not every salt is a base. Sodium chloride is a good example. You might know it as table salt. It comes from hydrochloric acid. However, the chloride part does not undergo hydrolysis. This means sodium chloride stays neutral. It does not become a base in water. There is also a difference between an alkali and a basic salt. An alkali is a soluble hydroxide. A basic salt is any salt that makes a basic solution.

Some of these salts do not dissolve easily. We call these insoluble salts. Scientists obtain them through precipitation reactions. This is a way where solids form from a mix. One example is white lead. Its real name is basic lead carbonate. You can also call it lead carbonate hydroxide. These materials dissolve well in polar solvents. Other examples include sodium acetate and potassium cyanide. You might also see sodium sulfide.

Alkaline salts are very useful in our homes. You can find them in dishwasher detergent powders. They are often the main part of the powder. These salts include alkali metasilicates and alkali metal hydroxides. Sodium carbonate and sodium bicarbonate are common examples. You can also find sodium percarbonate in these mixes. Other strong salts include sodium persilicate and potassium metabisulfite. These salts help the detergent do its job.

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