Salts

Question 1

How to carry out a titration

Answer 1

Add 25cm3 of Alkali using a pipette along with two or three drops of indicator

Fill burette with the acid below eye level

add the acid to the alkali slowly whilst swirling

Stop when the Colour change has just occurred

Record volume of acid used to neutralize the alkali

Question 2

Describe process of crystallising soluble solid

Answer 2

-Heat the solid in an evaporating basin
-Stop heating when crystals begin forming on a glass rod
-Leave crystals to form for a few days
-Filter out crystals
-Dry crystals using 2 pieces of filter paper

Question 3

How to prepare a pure, dry sample of a soluble salt with an alkali and an acid.

Answer 3

-Add alkaline to warmed acid until no more dissolves
-Stir the solution
-Filter to remove excess alkaline

-Crystallise

Question 4

How to prepare a pure, dry sample of an insoluble salt

Answer 4

-Dissolve both soluble substances in deionized water

-Mix the solutions together

-Filter the mixture

-Dry the solid (insoluble salt) between 2 pieces of filter paper

Question 5

Why is the acid warmed when making a soluble salt

Answer 5

To increase the rate of reaction

Question 6

How to obtain pure dry crystals of salt

Answer 6

-Stir and heat solution until crystals form on the glass rod
-Evaporate some of the water
-Leave solution to crystallize
-Pour off excess liquid
-Dry between 2 pieces of filter paper