The flow chart shows how a nitrogen fertiliser is manufactured, starting from a gas taken from the air. In the final step the ammonia is neutralised by nitr...
Question 1 Report
The flow chart shows how a nitrogen fertiliser is manufactured, starting from a gas taken from the air. In the final step the ammonia is neutralised by nitric acid. Use the flow chart to name the fertiliser salt made at the end.
Answer Details
Trace the flow chart from left to right. Nitrogen from the air is converted to ammonia, and the arrow into the final box is labelled +HNO3, nitric acid. An acid neutralised by ammonia always gives an ammonium salt named after that acid's anion, and nitric acid gives the nitrate ion, so the product is ammonium nitrate:
\[ \mathrm{NH_3 + HNO_3 \rightarrow NH_4NO_3} \]
Ammonium chloride would need hydrochloric acid and ammonium sulfate would need sulfuric acid, neither of which appears on the chart. Potassium nitrate is impossible because no potassium enters the process at any stage; both halves of a salt's name must come from something actually supplied. Read the label on the arrow before naming the product.
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