Acids

Question 1

Concentration

Answer 1

Concentration = amount dissolved/volume of solution
Units: grams per decimetre cubed, g dm-3

Question 2

Soluble salts

Answer 2

Step1-add excess tin oxide to hydrochloric acid.
Step2-gently warm the mixture in water bath to speed up reaction.
Step3-filter to remove unreacted solid
Step4-heat to evaporate water and concentrate the salt solution
Step5-leave to evaporate water slowly for crystallisation to occur and pat crystals dry.

Question 3

Insoluble salts

Answer 3

Step1-mix the two solutions in a beaker then filter the mixture.
Step2-rinse the beaker with distilled water and pour this through the funnel.
Step3-poor little distilled water over the precipitate in the funnel.
Step4-carefully, remove the filter paper containing the precipitate and dry it in a warm oven until crystallisation happens .