Page 2 - HA3
P. 2

1.  Did  you  observe  that  no  change  of  colour  took  place  when  phenolphthalein is
                   added to hydrochloric acid why?



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               2.  What would you observe if dilute sodium hydroxide will be taken in the test tube
                   and few drops of phenolphthalein is added to it?


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               3.  Do  you  observe  that  that  pink  coloured  solution  changes into  colourless  when
                   HCl solution is added to it why?


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               4.  Can you use any another indicator instead of phenolphthalein? Write names a
                   synthetic indicator can be used for this activity.

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