Question

A student test the pH of distilled water and found that the pH paper changed to green. Now he added some common salt to distilled water and pH paper is tested in this solution. The colour of pH paper in this case is likely to be:(a) Green (b) Yellow (c) Red (d) Blue

Answer 1

The colour would remain the same light green

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Answer 2

(a) Green

Explanation:

The pH of distilled water tested and the pH paper had turned green. Now that common salt is added to distilled water, ions of sodium and chlorine would be present in the water. The positive and negative ions will cancel each other out and the aqueous solution will remain neutral. So if pH is tested again, the pH paper would remain the same green colour as the solution is neutral.