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A road tanker carrying an acid was involved in an accident and its contents spilled on the road. At the side of the road iron drain cover began melting and fizzing as the acid ran over them. A specialist was called to see if the acid actually leaked into the nearby river. (a) Explain why specialist could carry out sample test to see of the river water contains some acid or not (b) Suggest a better report name for the word ‘melting’ (c) Explain why the drain covers began fizzing as the acid ran over them. |
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Answer» (a) It can be done by adding a strip of blue litmus paper into a tube containing a small amount of sample water if the colour changes into red, this means that some acid has gone into the river. (b) The acid has reacted chemically with the drain cover which is usually made of iron. The correct word is corrosion. (c) Iron reacts with an acid H2SO or HCl to evolveH2 gas. Since the gas is released immediately accompanied by large number of bubbles Fizzing of detain covers is expected. |
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