Chemistry 9701 · AS & A Level · Nitrogen and sulfur

Nitrogen and sulfur — practice question

Ammonium sulfate is a fertiliser made by reacting ammonia with sulfuric acid.
(a)[3]

Ammonia is called a weak base, whereas sulfuric acid is a strong acid. Using an equation, make clear what the term weak base means.

(b(i))

Sulfuric acid is made from sulfur trioxide, and sulfur trioxide is produced by the Contact process. State three key operating conditions for the Contact process used in the manufacture of sulfur trioxide. For each condition, do not use vague wording such as ‘high temperature’.

(b(ii))[4]

What process turns the sulfur trioxide produced into sulfuric acid?

(c(i))

1,3-Dichloropropan-2-ol (1,3-DCP), $\text{ClCH}_2\text{CH(OH)CH}_2\text{Cl}$, can be found in some foods. State the product formed when 1,3-DCP reacts separately with each of the following reagents under suitable conditions, and give the structural formula in each case: concentrated sulfuric acid; an excess of ammonia.

(c(ii))[4]

Describe, as fully as you can, the reaction type that takes place with ammonia.

Worked solution & mark scheme

This 11-mark question has a full step-by-step worked solution and mark scheme. One marking point: A base acts as a proton acceptor or as a lone pair donor

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