Plaster of paris should be stored in a moisture proof container explain why

Plaster of Paris, quick-setting gypsum plaster consisting of a fine white powder (calcium sulphate hemihydrate), which hardens when moistened and allowed to dry because plaster of Paris turns into Gypsum after reacting with moisture present in air. That’s why plaster of Paris should be stored in a moisture-proof container.

Plaster of Paris should be stored in a moisture-proof container. Explain why? Answer: Plaster of paris is a white powder. If it is not stored in a moisture-proof container, then it might react with moisture that penetrates through the container.. Upon reaction with water, it gets converted into a hard substance, called gypsum, whose properties are entirely different from that of plaster of paris. The reaction takes place as follows

(a) CaOCl 2 is chemically known as calcium oxychloride and common name is bleaching powder. Na 2CO 3.10H 2O is chemically known as sodium carbonate decahydrate and its common name is washing soda. (b) Plaster of Paris should be stored in a moisture-proof container because plaster of Paris, a powdery mass, absorbs water to form a hard solid known as gypsum. CaSO 4 . 1 2 H 2 O + 1 1 2 H 2 O → CaSO 4 . 2 H 2 O (c) The dissociation of acid is a highly exothermic reaction. When acid is slowly added to water, the heat produced is absorbed by the water. But if the water is added to the acid, the high amount of heat produced may lead to splashing of water. Thus, when diluting, the acid is always added to the water.

Q 1. You have been provided with three test tubes. One of them contains distilled water and the other two contain an acidic solution and a basic solution, respectively. If you are given only red litmus paper, how will you identify the contents of each test tubes? SOLUTION: Take three small pieces of red litmus paper. Put one drop each of the given solutions on these litmus papers. The liquid which turns red litmus into blue is a basic solution. Divide the blue litmus paper so formed into two parts. Put one drop each of the other two liquids separately on these two pieces of litmus paper. The solution which turns blue litmus paper red is acidic solution. The solution which does not affect the colour of litmus paper is water. Q 2. Why should curd and sour substances not be kept in brass and copper vessels? SOLUTION: The curd and sour substances are acidic. They will react with brass (alloy of copper and zinc metals) and copper vessels and will spoil the vessels. Q 3. Which gas is usually liberated when an acid reacts with a metal? Illustrate with an example. How will you test for the presence of this gas? SOLUTION: Hydrogen gas is liberated when an acid reacts with a metal. For example, when zinc metal reacts with dil.HCl, hydrogen is evolved and salt zinc chloride is formed as: Zn ( s) + 2HCl (aq) → ZnCl 2(aq) + H 2( g) It can be tested by bringing a burning candle near the gas. The candle continues burning with a pop sound. Q 4. A metal compound A reacts with dilute hydroc...

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Question 14: What is a neutralization reaction? Give two examples. Answer: A reaction in which an acid and base react with each other to give a salt and water is termed as neutralization reaction. In this reaction, energy is evolved in the form of heat. For example: (i) (ii) During indigestion (caused due to the production of excess of hydrochloric acid in the stomach), we administer an antacid (generally milk of magnesia, Mg(OH) 2which is basic in nature). The antacid neutralizes the excess of acids and thus gives relief from indigestion.