You wet the pH paper before the ignition of the match in order to estimate the pH of the given solution. Those compounds which are not soluble in water tend to possess an inflammable property and the estimation of pH in this condition is useless.
What is the use of pH paper?
The pH paper is used to determine the pH of any solution under any circumstances. It has various colors that reveal the actual pH of any solution.
Therefore, it is well described above.
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