Acids & Bases - exam practice
Acids & Bases
Question 1 of 3
The higher the concentration of a sample of dilute acid, the greater the volume of alkali needed to neutralise the acid.
The student tested two samples of the same dilute acid, A and B.
Describe how the student could use titrations to find which sample, A or B, is more concentrated.
Lead nitrate is a salt.
A student produces lead nitrate using an acid and a base.
Which acid should the student use to produce lead nitrate?
Which of the the following is a base the student could use to produce lead nitrate?
Lead nitrate solution mixed with sodium sulfate solution forms lead sulfate as a precipitate.
Pb(NO3)2 + Na2SO4 ➔ PbSO4 + 2NaNO3
The method used to make the lead sulfate is:
- Pour 100 cm3 lead nitrate solution into a beaker.
- Add drops of sodium sulfate solution until a precipitate is seen.
- Allow the precipitate to settle to the bottom of the beaker.
- Pour off the liquid.
- Use a spatula to transfer the solid lead sulfate onto a filter paper.
State and explain two ways of improving this experimental method in order to increase the amount and quality of lead sulfate that could be obtained from 100 cm3 of lead nitrate solution.
Ammonium nitrate and potassium chloride are both salts.
They can be made by neutralisation reactions.
Complete the word equations below.
ammonia + ➔ ammonium nitrate + water
potassium hydroxide + hydrochloric acid → potassium chloride +
A student dissolved some crystals of an unknown salt in water.
The student added sodium hydroxide solution to the salt solution until it was in excess.
Describe what the student would see if the salt contained calcium ions.
Would the result predicted in part a) prove that the salt contains calcium ions?
Explain your answer.
Describe an additional test the student could do that would prove the salt contains calcium ions.