(1) turned blue(2)did not change(3)turned green and suddenly yellow(4)turned light pink"">

Solid sodium bicarbonate was placed on a strip of pH paper. The colour of the strip:
(1) turned blue(2)did not change
(3)turned green and suddenly yellow(4)turned light pink

Correct answer:  (2) did not change

Explanation: pH paper changes its color when H+ ions are produced. This happens only if the substance to be tested is in the ionic form or if the pH paper is wet. Since sodium bicarbonate is in solid form, the pH paper does not change its colour.


Simply Easy Learning

Updated on: 10-Oct-2022


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