Question 12 Marks
a. If you have phenolphthalein as an indicator, how will you test for acid and base?
b. What will be the colour of a blue litmus paper on bringing it in contact with a drop of dil. NaOH ?
b. What will be the colour of a blue litmus paper on bringing it in contact with a drop of dil. NaOH ?
Answer
View full question & answer→a. The Phenolphthalein in neutral solution is colourless. When it is added to a basic solution the colour changes to pink and it remains colourless in acidic solution.
b. The colour of blue litmus paper will remain blue as a drop of dil. NaOH is a base and base will not change the color of blue litmus paper.
b. The colour of blue litmus paper will remain blue as a drop of dil. NaOH is a base and base will not change the color of blue litmus paper.