Question

Three liquids,dilute acid solution,alkaline solution and distilled water were kept in an unlabelled identical ragent bottle. Describe briefly a test that could be performed to identify each of the liquid.

Answer 1

There are two simple tests. The first is an identification of pH solution by using indicator paper. In acid solution it becomes red, in alkaline solution – deep blue and in distilled water – no change is happening.
The second is instrumental method by using pH-meter. In the acidic solution – pH is less than 7, in distilled water – 7 and in alkaline solution – more than 7.