Fill a burette wuth 0.1M dilute sulphuric(VI)acid. Pipette 20.0cm³ of 0.1M sodium hydroxide solution into a 250cm³ conical flask. Add three drops of phenolphthalein indicator....

Fill a burette wuth 0.1M dilute sulphuric(VI)acid. Pipette 20.0cm³ of 0.1M sodium hydroxide solution into a 250cm³ conical flask. Add three drops of phenolphthalein indicator. Titrate the acid to get a permanent colour change.Repeat with 0.1M potassium hydroxide solution in place of 0.1M sodium hydroxide solution.
State and explain the observations made.

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1. Observation:
Colour of phenolphthalein changes from pink to colourless at the end point.

2. Explanation
Like other (mineral) acids dilute sulphuric(VI)acid neutralizes bases/alkalis to a sulphate salt and water only.
Colour of the indicator used changes when a slight excess of acid is added to the base at the end point.

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Wilfykil answered the question on February 19, 2019 at 08:16

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