Interpretation of pH: pH describes the degree of acidity and alkalinity of aqueous solution, which is expressed by pH value. Under thermodynamic standard conditions, the aqueous solution with pH=7 is neutral, while the solution with pH7 is alkaline.

Definition of alkaline water: water (chemical formula: h? O) It is an inorganic substance composed of hydrogen and oxygen, and it is a colorless and odorless transparent liquid at normal temperature and pressure. Generally speaking, the PH of tap water we commonly use is neutral (PH=7), but its pH value will be different because of other dissolved substances in water, such as minerals dissolved in natural mineral water. There is a clear definition of alkaline water in China. According to the national standard GB/T14157-1993 <: < Hydrogeological terms > > According to the definition given in section 5.1.10.9-5.1.11,water with a PH below 6.4 is called acidic water, and water with a PH between 6.5 and 8.0 is called neutral.

The reason why water is too alkaline: Natural water (including natural mineral water, natural spring water, natural surface water, and natural mountain spring water) will have different properties depending on its minerals. For example, mineral-rich water is often alkaline, while most minerals are metallic minerals, and metallic minerals are mostly left in mineral water in the form of ions, and these ions are strongly alkaline ions, so that acidic H+ ionized from water molecules (H+ hydrogen ions and OH- hydroxide ions) are associated with mineral ions to form neutral molecules, thus more alkaline OH- ions are released, so water shows weak alkalinity.

Measuring the pH value of the solution: Add a pH indicator to the solution to be measured, and different indicators will change color according to different pH values.