Assessment and Qualifications Alliance (AQA) GCSE Biology Paper 2 Practice Exam 2026 - Free AQA GCSE Biology Practice Questions and Study Guide

Ammonia is primarily utilized in the manufacture of ammonium salts. Ammonium salts are compounds that contain the ammonium ion, NH4+. They are widely used in various applications, including as fertilizers, in water treatment, and as food additives. The synthesis of these salts often involves the reaction of ammonia with acids, leading to a variety of ammonium-based products that are crucial for agriculture and will enhance soil fertility.

The other options refer to substances that, while important in their own right, do not primarily derive from ammonia. Calcium phosphate is typically made through chemical processes that do not involve ammonia directly. Sulfuric acid is produced primarily from sulfur, not ammonia. Organic fertilizers can be made from a variety of sources and do not inherently require ammonia for their production, though ammonia can be used in some formulations. However, the straightforward and predominant use of ammonia remains its transformation into ammonium salts.