C2: Fertilisers (experiment)

Ella Maggs
Flashcards by Ella Maggs, updated more than 1 year ago
Ella Maggs
Created by Ella Maggs about 5 years ago


All information is sourced from the Collins revision textbook, GCSE OCR Gateway B Higher.

Resource summary

Question Answer
Explain the process of producing a fertiliser from the reaction of an acid and an alkali. Step 1 The alkali is titrated with the acid using an indicator to find out the quantities needed before the main batch is made, this is repeated until the results are consistent.
Step 2 Although the acid and alkali have fully reacted to produce a neutral solution of ammonium fertiliser. However, the this batch is contaminated with universal indicator.
Step 3 The titration results are used to repeat the experiment, now using the correct quantities.
Step 4 The dissolved fertiliser is heated to evaporate most of the water off, then left for the remaining solution to crystallise. The crystals are then filtered off.
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