Describe treatment of phosphate rock with phosphoric acid to produce soluble salts for fertilisers. (Chemistry only)

In the subtopic Production and uses of NPK fertilisers, this learning objective focuses on describe treatment of phosphate rock with phosphoric acid to produce soluble salts for fertilisers. (Chemistry only). Within The Haber process and the use of NPK fertilisers, students should explain this idea in the exact curriculum context rather than as an isolated fact. Approved keywords for this objective include chemistry only, salt, phosphoric acid, phosphate rock, and soluble salt. phosphate rock means a naturally occurring mineral used as a source of phosphorus for fertiliser production. Avoid students often confuse the treatment of phosphate rock with phosphoric acid with treatments using nitric or sulfuric acid; instead remember that phosphoric acid specifically produces soluble salts from phosphate rock, while nitric and sulfuric acids produce different salts. For exam answers, memorize the treatment of phosphate rock with phosphoric acid to produce soluble salts, focusing on the chemical reaction involved.