Salt Preperation

Question 1

Acid and alkali to make a soluble salt

Answer 1

TITRATION
Acid should be added SLOWLY
Stop when pH is exactly 7
A neutral solution tells us the solution only contains salt and water
This is done by TITRATION using an indicator to see when the pH is exact 7
Indicator used should be phenolphthalein as it goes from pink to colourless

Question 2

Soluble salt from an acid and an INSOLUBLE base (eg. Sulfuric acid + copper oxide powder)

Answer 2

HEAT ACID
Add EXCESS copper oxide to ensure all the acid reacts
Leftover copper oxide is filtered out to leave a solution of salt and water
Gently heat to evaporate some of the water
Leave remaining to evaporate SLOWLY (crystallisation)

Question 3

Insoluble salt

Answer 3

Two solutions of soluble salts
If precipitate forms an insoluble salt has formed
Filter and wash with distilled water

Question 4

Neutralising an acid

Answer 4

Add small portions of a powdered metal hydroxide
Fixed volume of acid
Record ph after each addition