What is another name for calcium hydroxide?

On construction sites,workers often mix white powder with water and stir it into a thick paste for building walls;In the chemistry laboratory,this substance appears on reagent bottles under the scientific name"calcium hydroxide".It is not only an important raw material in industrial production,but also a frequent visitor in middle school chemistry textbooks.However,when asked what the other name for calcium hydroxide is,many people were momentarily speechless.

Calcium hydroxide is an inorganic compound formed by the combination of calcium ions and hydroxide ions in a ratio of 1:2,and is a strongly alkaline substance.Its physical properties are distinct:it is a white powdery solid at room temperature,slightly soluble in water,and its solubility decreases with increasing temperature;Water solution,commonly known as"lime water",is highly alkaline and can corrode skin and clothing,but it is also a"catalyst"for many chemical reactions.
From a chemical perspective,calcium hydroxide has two core characteristics:
Alkaline:can undergo neutralization reaction with acid,generating salt and water.
Corrosivity:Long term contact can damage organic tissues,so it needs to be sealed and stored,and direct contact should be avoided.
These characteristics determine its wide application in industries,agriculture,environmental protection,and other fields,and its"alias"is closely related to these application scenarios.
Another well-known name for calcium hydroxide is"hydrated lime",and behind this name lies a chemical evolution history of the"lime family".
1.Quicklime
The main component of lime is calcium oxide,which is calcined from natural limestone at high temperatures
CaCO∝→CaO+CO₂↑
The calcium oxide generated by this reaction is in the form of white blocks,commonly known as"quicklime".Lime has strong water absorption and reacts violently with water,releasing a large amount of heat
CaO+H₂O→Ca(OH)₂+heat
2.Hydrated lime
The calcium hydroxide produced by the reaction between quicklime and water is called"hydrated lime"because its reaction process is similar to"boiling quicklime".This name not only vividly describes the preparation process,but also implies the"mildness"of its chemical properties-compared to the strong corrosiveness of quicklime,the alkalinity of quicklime is easier to control and more suitable for direct use.
3.Hydrated lime

In some regions,calcium hydroxide is also known as"hydrated lime".This name comes from the property that its aqueous solution can"eliminate"acidic substances.

Ca(OH)₂+CO₂→CaCO∝↓+H₂O
This reaction is a classic method for testing carbon dioxide and also the chemical basis for the name"hydrated lime".
The dispute between the"common name"and"scientific name"of calcium hydroxide is essentially a collision between the"systematic naming convention"and the"traditional naming convention"in the chemical naming system.
Systematic nomenclature:based on chemical formulas,emphasizing structure and composition.
Traditional naming convention:Combining material sources,properties,or uses,it is more intuitive and practical.
The two naming methods are not contradictory,but complementary.For example,"calcium hydroxide"clarifies the chemical nature of substances,while"hydrated lime"reveals its preparation process and application scenarios.This"double naming"phenomenon is not uncommon in chemistry,as they together build a bridge between chemical knowledge and daily life.