Question

uses of plaster of paris and washing soda and bleaching powder andBaking soda

Answer 1

washing soda...
@used as cleansing agent.
@removing permanent hardness of water.
@manufacture of glass

baking soda...
@used to make antacids.
@used to make baking powder.
@used in fire extinguishers.

plaster of Paris...
@used in hospitals for setting fractured bones.
@used in making toys, ornaments.
@used in making smooth surfaces..

Answer 2

◼PLASTER OF PARIS:-

=> It is prepared by heating gypsum at 373 k it loses water molecules and become plaster of Paris.

=>$CaSO4 .2 H2O - - > CaSO4 \frac{1}{2} .H2O + 1 \times \frac{1}{2} H2O$

Uses:-

✔It is used for making surface smooth wall's celling.

✔It is used by the doctor to support fractured in right position.

✔It is used for making toys and decoration purposes.

______________________________

◼WASING SODA :- (NA2CO3.10 H2O) sodium carbonate dechydrate

It is obtained by heating baking soda and then re - crystallisation of sodium carbonate gives washing soda .

=>Na2CO3 -----> Na2CO3+H2O+ CO2 (presence of heat )

=>Na2CO3 + 10H2O --------> Na2CO3 .10H2O

USES:-

=> It is used for making borax

=> It is used for removing permanent hardness of water.

=> It is used for domestic purposes as a cleansing agent.

=> It is used in glass soap and paper industries.

______________________________

◼ BLEACHING POWDER:- CaOCl2 ( calcium oxide chloride)

It is prepared by passing chlorine gas through dry slaked lime.

=>Ca(OH)2+Cl2 ------> CaOCl2 + H2O

Uses:-

=>It is used for bleaching cotton and linen in textile industry.

=> It is used for bleaching wood pulp in paper factories and for bleaching washed clothes in laundry.

=> As an Oxidising agent in many chemical industries.

=> It is used for disenfecting drinking water to make it free of germs.

______________________________

◼ BAKING SODA:- (NaHCO3) sodium hydrogen carbonate

It is prepared from NaCl

=>NaCl + H2O + CO2 + NH3----> NH4CL + NaHCO3

USES:-

=> It is used for making baking powder.

=> As an ingredient in antacids.

=>It is also used in soda acid fire extinguishes.