Preparation Of Distilled Water

Question 1

Forms of Water supplied in the laboratory

Answer 1

Tap water
Distilled water
Deionised water
Double Distilled water

Question 2

Tap water at lab

Answer 2

-Many undesirable nutrients and organic matter
-not used for reagent preparation

Question 3

Distilled water

Answer 3

-by removing organic material &minerals from ordinary tap water
-it may not be sterile ,may contain dissolved gases like ammonia,co2, cl
-clear,colourless, odourless

Question 4

Deionised water used in lab

Answer 4

-electrolytes and minerals salt removed by chemical method passing through iron change resin
-free from ionising minerals
-contain organic material and non ionisable substances

Question 5

Double distilled water in lab

Answer 5

By redistilling the distilled water

Question 6

Water distillation apparatus

Answer 6

Still

Question 7

Water distillation apparatus

Answer 7

Tapwater -boil-steam-cool-condensor -steam pass through condensor-cold water passed through condensor-steam condensor-water in the outlet-distilled water

Question 8

2 types of stills

Answer 8

Metal still
Glass still

Question 9

Metal stills and glass stills

Answer 9

Metals -using electricity, kerosene, gas
Made up of stainless steel
Capacity, 1 to2 L/hr
Glass -electric heating, expensive
More pure and yield more quantity of distilled water
Heating tapwater in round bottom flask
Distilled water does not contain minerals

Question 10

Components of still

Answer 10

Inlet
Outlet
Condensor
Condensor tube
Lid
Overflow pipe
Flow circuit
Water pressure monitoring device
Resin column