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 covers began melting and fizzing as the acid ran over them. A specialist was celled to se if the acid actually leaked into the nearby river.
(a) Explain how the specialist could carry out a simple test to see if the river water contains some acid or not.
(b) The word 'melting' is incorrectly used in the report. Suggest a better name that should have been used for the same purpose.
(c) Explain why the drain covers began fizzing as the acid ran over them.