Question

What is the common name of the compound CaOCL?
Name the substance which on treatment with chlorine yields bleaching
powder.
Name the sodium compound which is used for softening hard water.
What will happen if a solution of sodium hydrocarbonate is heated?
Give the equation of the reaction involved.
Write an equation to show the reaction between Plaster of Paris and
water.​

Answer 1

Answer:

1. Bleaching Powder (Chem. name - Calcium Oxychloride)

2. Slaked Lime (Calcium Hydroxide - Ca(OH)₂)

3. Washing soda (Sodium Carbonate Decahydrate - Na₂CO₃.10H₂O)

4. It will decompose to give sodium carbonate, water and carbon-dioxide gas.

2NaHCO₃ ----------> Na₂CO₃ + H₂O + CO₂

5. Plaster of paris combines with water to form gypsum.

CaSO₄.½H₂O + 1½H₂O ------------> CaSO₄.2H₂O

Answer 2

Answer:

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(1.) Bleaching Powder (CaOCl₂)-Calcium oxychloride

(2.) Calcium Hydroxide or Slaked lime (Ca(OH)₂)

Ca(OH)₂+Cl₂→CaOCl₂+H₂O

(LIME WATER)

(3.) Washing Soda (NaCO₃.10H₂O)-Sodium Carbonate decahydrate

(4.) Sodium hydrogen carbonate decomposed into sodium carbonate(Soda ash) and give water along with a brisk effervescence of Carbondioxide.

2NaHCO₃→(∆H)→Na₂CO₃+CO₂↑+H₂O

(SODA ASH)

(5.) Plaster of paris(Calcium sulphate hemihydrate) gains one and a half moles of water molecules to form Gypsum(A Hard Substance)

CaSO₄.½H₂O+1½→CaSO₄.2H₂O

(GYPSUM)