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A student added blue litmus solution to a colourless aqueous solution. The solution turned red. Which one of the following chemicals should be added in excess so that the change in colour is reversed ?(1) ethanol solution(2) caustic soda solution(3) hydrochloric acid solution(4) vinegar solution |
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Answer» A student added blue litmus solution to a colourless aqueous solution. The solution turned red. Which one of the following chemicals should be added in excess so that the change in colour is reversed ? (1) ethanol solution (2) caustic soda solution (3) hydrochloric acid solution (4) vinegar solution |
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