Preparing a salt practical

Question 1

What is the first step in producing a salt solution?

Answer 1

React acid with base to produce salt solution

Measure and pour a fixed volume of acid into a conical flask.

Question 2

What should be added gradually to the acid during the reaction?

Answer 2

Base (e.g., copper oxide powder, magnesium ribbon, or sodium carbonate)

This addition helps in neutralizing the acid.

Question 3

What is the purpose of stirring the mixture with a glass rod?

Answer 3

To help it react

Stirring ensures thorough mixing of the acid and base.

Question 4

How can you tell that the acid is completely neutralized?

Answer 4

When excess solid remains undissolved

This indicates that no more acid can react with the base.

Question 5

What should be done if there is excess solid after neutralization?

Answer 5

Filter the mixture to remove unreacted base

Collect the filtrate, which is the salt solution.

Question 6

What is the second step after producing the salt solution?

Answer 6

Evaporate water to crystallize salt

Pour the salt solution into an evaporating basin.

Question 7

How should the salt solution be heated during crystallization?

Answer 7

Gently using a Bunsen burner

Heat until crystals start to form, but do not evaporate to dryness.

Question 8

What should be done after heating the solution to form crystals?

Answer 8

Remove from heat and allow the solution to cool slowly

Crystals will form as it cools.

Question 9

What is the third step in the process of salt production?

Answer 9

Collect and dry crystals

This involves filtering and washing the crystals.

Question 10

What should be done to the crystals after filtering them?

Answer 10

Wash the crystals with a small amount of cold distilled water

This removes impurities from the crystals.

Question 11

How should the crystals be dried after washing?

Answer 11

By placing them on a watch glass or paper towel

This helps to remove water for pure, solid salt.

Question 12

Fill in the blank: Add base slowly and stir to ensure _______.

Answer 12

complete and controlled reaction

Question 13

Fill in the blank: Add base until excess to confirm _______.

Answer 13

acid is fully neutralized

Question 14

Fill in the blank: Filter excess base to remove impurities for _______.

Answer 14

pure salt

Question 15

Fill in the blank: Heat gently to concentrate solution without damaging _______.

Answer 15

salt

Question 16

Fill in the blank: Cool solution to encourage _______.

Answer 16

salt crystallization

Question 17

Fill in the blank: Filter and wash crystals to separate and _______.

Answer 17

purify crystals

Question 18

Fill in the blank: Dry crystals to remove water for _______.

Answer 18

pure, solid salt