Description: A long glass tube is filled almost full of Universal Indicator solution. A few drops of 0.02M HCl is added to one end and stopper, and a few drops of 0.02M NaOH is added to the other end. The tube is inverted a few times to see all the universal indicator colors.

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Source: Chem13 News #190; December

Year or vol: 1989 page: 12

Keywords: acids, bases, ,