Making Table Salt
Aim: To make sodium chloride crystals by neutralizing an acid with a base (alkali)
Method:
1. Measure 10ml of hydrochloric acid (HCl) in the small measuring cylinder and pour into a 50ml beaker.
2. Add dilute sodium hydroxide (NaOH) to the acid a few drops at a time while stirring with a glass stirring rod.
3. Use the glass stirring rod to transfer a drop of the solution to a spotting tile. Add a drop of universal indicator. Is it neutral? (green)
4. Once it is neutralised (pH = 7 - green) pour the liquid into an evaporating dish and heat till it boils slowly.
Observations: Write one observation for each step of the method.
1. The acid was really strong so we had to use ten mills of base, and add 5 drops of acid.
2. The water evaporated really fast, but the water in the evaporating dish was still there.Method:
1. Measure 10ml of hydrochloric acid (HCl) in the small measuring cylinder and pour into a 50ml beaker.
2. Add dilute sodium hydroxide (NaOH) to the acid a few drops at a time while stirring with a glass stirring rod.
3. Use the glass stirring rod to transfer a drop of the solution to a spotting tile. Add a drop of universal indicator. Is it neutral? (green)
4. Once it is neutralised (pH = 7 - green) pour the liquid into an evaporating dish and heat till it boils slowly.
Observations: Write one observation for each step of the method.
1. The acid was really strong so we had to use ten mills of base, and add 5 drops of acid.
3. After we were left with a white substance on the bottom of our evaporating dish.
Word equation for the reaction:
Hydrochloric acid + Sodium Hydroxide --> Sodium Chloride + water
Balanced symbol equation for the reaction:
Balanced symbol equation for the reaction:
HCl + NaOH = NaCl + H2O
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