Methods Of Salt Preparation

Question 1

Insoluble Carbonate

Answer 1

1. Add to acid in excess
2. Filter out excess base once reaction is completed (no more bubbles)
3. Heat indirectly until supersaturation (crystals start to form)
4. Leave out at room temperature to dry and allow crystals to form
5. Filter out crystals and dry with filter paper

Question 2

Insoluble Salt

Answer 2

1. Identify combination of soluble salts needed
2. React the two solutions
3. Filter out the formed precipitate
4. Wash and dry the precipitate

Question 3

Solubility Rules

Answer 3

• All nitrates are soluble
• Na + K + NH4 are soluble
• Cl + Br + I are soluble unless Ag or Pb
• Sulphates are soluble unless Ba,Pb + Ca
• Carbonates are insoluble

Question 4

MAZI Metal (Mg, Al + Zn)

Answer 4

1. Add xs metal to acid
2. Filter out xs once reaction is completed (no more bubbles)
3. Heat indirectly until supersaturation
4. Leave it at room temperature
5. Filter out crystals and dry on filter paper

Question 5

Insoluble Base

Answer 5

1. Warm the acid
2. Add xs base to acid
3. Filter out xs base when there are no more bubbles
4. Heat indirectly over water bath until supersaturation
5. Leave crystals to form at room temperature
6. Filter out crystals and dry on filter paper

Question 6

Titration

Answer 6

1. Measure out alkali using volumetric pipette
2. Add indicator
3. Swill burette with acid then fill + record initial value
4. Add acid drop by drop until colour change is visible
5. Record values and repeat without indicator for purity