Salts

Question 0

What does hydrochloric acid make

Answer 0

Chlorides

Question 1

How are soluble salts made

Answer 1

Using an excess of an insoluble base such as copper oxide

Question 2

What does nitric acid make

Answer 2

Nitrates

Question 3

What does sulphuric acid make

Answer 3

Sulphates

Question 4

State why an excess of zinc oxide is needed when making zinc chloride

Answer 4

To make sure that all acid has reacted

Question 5

How are soluble salts made

Answer 5

Using an acid and an exact amount of the soluble base such as sodium hydroxide solution

Question 6

Name the three steps needed to make a soluble salt from a soluble base

Answer 6

Use an acid base titration to find the exact volume of the soluble base that reacts with the acid

Mix the acid and soluble base in the correct proportions producing a solution of the salt and water

Warm the salt solution to evaporate the water this will leave crystals of the salt behind

Question 7

What do acids release when they dissolve in water

Answer 7

Hydrogen ions

Question 8

What do soluble bases release when dissolved in water

Answer 8

Hydroxide ions

Question 9

What happens when an acid-base titration involves a neutralisation reaction

Answer 9

Hydrogen ions from the acid reacts with the hydroxide ions from the base

Question 10

Describe how you would carry out an accurate titration in which the alkali is placed in a conical flask. Name a suitable indicator and describe its colour change.

Answer 10

Use a pipette to transfer a known volume of alkali to a conical flask. Add a few drops of phenolphthalein indicator. Fill the burette with acid and note the reading. Open the tap and add acid to the alkali. Swirl the flask to mix the contents. Near the end the indicator will start to change from pink to colourless. Adjust the tap to add the alkali drop by drop near the end point. Close the tap at the end point and note the new burette reading. Repeat until you get concordant results.