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Question
Write down the changes that will be seen in the instance and explain the reason behind them.
A litmus paper was dropped into 2ml dilute HCl. Then 2ml concentrated NaOH was added to it and stirred.
Solution
When litmus paper is dipped into 2 mL of dilute HCl solution, then blue litmus paper is turned into red colour and there is no effect on red litmus paper. Again, if the same litmus paper is dipped into 2 mL of concentrated NaOH solution, then red litmus paper turns into a blue colour but there is no effect on blue litmus paper. This is due to the respective properties of blue and red litmus paper with acid and base.
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