What happens chemically when quicklime is added to water

When water is added gradually to a white solid X, a hissing sound is heard and a lot of heat is produced forming a product Y. A suspension of Y in water is applied to the walls of a house during white washing. A clear solution of Y is also used for testing carbon dioxide gas in the laboratory. a) What could be solid X? Write its chemical formula. b) What could be product Y? Write its chemical formula. c) What is the common name of the solution of Y which is used for testing carbon dioxide gas? d) Write chemical equation of the reaction which takes place on adding water to solid X. e) Which characteristics of chemical reactions is illustrated by this example? State one characteristics each of the chemical reaction which takes place when: 1. Dilute hydrochloric acid is added to sodium carbonate. 2. Lemon juice is added gradually to potassium permanganate solution. 3. Dilute sulphuric acid is added to barium chloride solution. 4. Quicklime is treated with water. 5. Wax is burned in the form of a candle.

Quicklime What is Quicklime? Quicklime is an alternate name for the chemical compound known as calcium oxide. This compound is represented by the chemical formula CaO and is also known as burnt lime. Under standard conditions for temperature and pressure, quicklime is known to exist as a crystalline solid that is white in colour. It is important to note that quicklime is known to be fairly caustic and alkaline under standard conditions. The term ‘lime’ is usually used to denote chemical compounds that contain the element calcium. Quicklime is known to be quite inexpensive and abundant. It can also be noted that quicklime (along with another one of its derivatives, Table of Contents • • • • • • Preparation of Quicklime Quicklime is a calcium oxide formed to release carbon dioxide by calcinating calcium carbonate (limestone). Quicklime is also referred to as handpicked lime, burnt lime, lump lime, calcining lime, and caustic lime. It is known to be a caustic material that is prepared at approximately 900 degrees Celsius by burning calcium carbonate limestone, carbon dioxide is forced off at this high temperature, and the limestone is converted to Quicklime. It is a whitish, odourless alkaline substance with the chemical formula CaO. It can be noted that this compound does not dissolve well in water. As a lining material, it can be used. The main usage is in various industrial processes such as metal smelting, paper bleaching, and sugar sulphur neutralisation, among many ...

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State one characteristics each of the chemical reaction which takes place when: 1. Dilute hydrochloric acid is added to sodium carbonate. 2. Lemon juice is added gradually to potassium permanganate solution. 3. Dilute sulphuric acid is added to barium chloride solution. 4. Quicklime is treated with water. 5. Wax is burned in the form of a candle. When water is added gradually to a white solid X, a hissing sound is heard and a lot of heat is produced forming a product Y. A suspension of Y in water is applied to the walls of a house during white washing. A clear solution of Y is also used for testing carbon dioxide gas in the laboratory. a) What could be solid X? Write its chemical formula. b) What could be product Y? Write its chemical formula. c) What is the common name of the solution of Y which is used for testing carbon dioxide gas? d) Write chemical equation of the reaction which takes place on adding water to solid X. e) Which characteristics of chemical reactions is illustrated by this example?

When quicklime (calcium oxide- CaO) is added to water, it reacts vigorously with water to produce slaked lime (calcium hydroxide) and releases a large amount of heat. The reaction that takes place is: CaO + H 2O → Ca(OH) 2 Quick lime Slaked lime The above reaction is an example of combination reaction in which calcium oxide and water combined together to form a single product, calcium hydroxide.

Quicklime What is Quicklime? Quicklime is an alternate name for the chemical compound known as calcium oxide. This compound is represented by the chemical formula CaO and is also known as burnt lime. Under standard conditions for temperature and pressure, quicklime is known to exist as a crystalline solid that is white in colour. It is important to note that quicklime is known to be fairly caustic and alkaline under standard conditions. The term ‘lime’ is usually used to denote chemical compounds that contain the element calcium. Quicklime is known to be quite inexpensive and abundant. It can also be noted that quicklime (along with another one of its derivatives, Table of Contents • • • • • • Preparation of Quicklime Quicklime is a calcium oxide formed to release carbon dioxide by calcinating calcium carbonate (limestone). Quicklime is also referred to as handpicked lime, burnt lime, lump lime, calcining lime, and caustic lime. It is known to be a caustic material that is prepared at approximately 900 degrees Celsius by burning calcium carbonate limestone, carbon dioxide is forced off at this high temperature, and the limestone is converted to Quicklime. It is a whitish, odourless alkaline substance with the chemical formula CaO. It can be noted that this compound does not dissolve well in water. As a lining material, it can be used. The main usage is in various industrial processes such as metal smelting, paper bleaching, and sugar sulphur neutralisation, among many ...