The pinyin for alkali is jiǎn and the tone is upper.

The word alkali is a noun denoting a chemical substance, usually an ion that is positively charged in solution. An alkali is a chemical element or compound that usually has the properties of a metal cation and a hydroxide ion (OH-). Bases are able to accept hydrogen ions (H+) in solution and form positive ions, which neutralize the acidity of the solution.

Bases are widely used in chemical experiments and industrial production, such as sodium hydroxide (NaOH) and calcium hydroxide (Ca(OH)2). These substances have important applications in many fields, such as the manufacture of paper, textiles, and cleaning agents. The use of alkali is not limited to industrial production, but also as household cleaners and stain removers. For example, soda ash (Na2CO3) is a common ingredient in detergents to remove stains and grease.

Alkalis also have applications in biology and medicine. For example, a weakly alkaline solution can be used to wash wounds and clean the mouth, among other things. In life, alkali can also refer to other meanings. For example, in some areas, alkaline soil is referred to as alkaline soil, and alkaline water is referred to as alkaline water.

Applications of alkali:

1. Paper manufacturing: alkali can be used to make paper, especially recycled pulp and lignin remover. Recovered pulp is a new pulp made from fibers extracted from waste paper.

2, textile manufacturing: in textile manufacturing, alkali can be used to treat cotton fabrics and synthetic fibers to improve their performance. For example, treating cotton fabrics with sodium hydroxide can make them softer and wrinkle-resistant.

3, detergent manufacturing: alkali is the main ingredient in many detergents, such as laundry detergent and soap.

4, metal cleaning: alkali can be used to clean metal surfaces to remove grease and dirt.

5, glass products manufacturing: in the manufacture of glass products, alkali can be used to control the melting and solidification process of glass, and improve the quality of glass.

6, pharmaceutical industry: in the pharmaceutical industry, alkali can be used to adjust the pH value and preparation of drugs. For example, sodium hydroxide and calcium hydroxide and other common alkali can be used to adjust the pH value of drugs.

7, agriculture: in agriculture, alkali can be used to improve soil quality and management. For example, weakly alkaline soil helps promote plant growth and development.

8, water treatment: in the process of sewage treatment and water quality improvement, alkali can be used to adjust the pH value and remove harmful substances.

9, petroleum industry: in the petroleum industry, alkali can be used to improve oil recovery and clean petroleum products. For example, the use of sodium hydroxide can neutralize the acids in petroleum.

10, synthetic resins: in the production of synthetic resins, alkali can be used as a catalyst and reactants involved in the reaction, such as the synthesis of epoxy resin.