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Answer the following : (a) Why is Plas...

Answer the following :
(a) Why is Plaster of Paris written as `CaSO_(4)1//2H_(2)O` How is it possible to have half a water molecule attached to `CaSO_(4)` ?
(b) Why is sodium hydrogen carbonate an essential ingredient in antacids ?

Text Solution

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(a) The actual formula of Plaster of Paris is `2CaSO_(4).H_(2)O` which means that one molecule of `H_(2)O` is associated with two molecules of `CaSO_(4).` The formula is simplified and written as `CaSO_(4).1//2H_(2)O.`
(b) Sodium hydrogen carbonate is an essential constituent of antacids because it neutralises the effect of hydrochloric acid which is released in the stomach. That is way it is called antacid.
`NaHCO_(3)+HCl toNaCl+H_(2)O+CO_(2).`
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DINESH PUBLICATION-ACIDS, BASES AND SALTS -SHORT ANSWER QUESTIONS
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  2. Account for the following : (a) Antacid tablets are used by a person...

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  3. Answer the following : (a) Why is Plaster of Paris written as CaSO(4...

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  4. (a) Write the name given to bases that are highly soluble in water. Gi...

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  5. (i) Identify the compound of calcium which is yellowish powder and is ...

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  6. A substance X which is used as an antacid reacts with dilute hydrochlo...

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  7. Chemical Properties Of Acids And Bases

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  8. In a gas jar containing hydrogen chloride gas, a dry blur litmus paper...

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  9. Explain why sodium hydroxide solution cannot be kept in aluminium cona...

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  10. State what does pH of a solution signify. Three solutions A, B and C h...

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  11. A ehite chemical compound becomes hard on mixing proper quantity of wa...

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  12. (a) Define pH scale. Draw a figure showing variation of pH which chang...

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  14. State the observations you would make on adding sodium hydroxide to aq...

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  15. (a) Name one natural source of each of the following acids. (i) Citr...

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  16. 2 mL of sodium hydroxide solution is added to a few pieces of granulat...

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  17. (a) Identify the compound of calcium which is used for plastering frac...

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  18. Why do HCl, HNO(3), etc., show acidic characters in aqueous solutions ...

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  19. (a) Why are some salts called hydrated salts ? (b) Give two examples...

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