Drops of dilute acid and alkali are placed a few centimetres apart on a sheet of filter paper and allowed to spread out until they meet. A few drops of Universal indicator are then placed over the moist area of the filter paper and a band of colours showing the range of colours of the Universal indicator is seen on the paper.
This practical is part of our Chemistry for Non-Specialists collection.
2022-04-18T08:30:00Z
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2022-02-14T07:30:00Z
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