Question

QUESTIONS Submit your answers on a separate sheer as necessary.) 1. What is the purpose of the indicator? How does it se of the indicator? How does it tell you when the titration is com Give two reasons for the statement below: (Hint: Consider both your own experiment and that of the person who uses the balance after you) Always dry the outside surfaces of beakers, flasks, and other pieces of glassware before you place them on the balance pan. 3. Fill in the blanks for the following by circling the answer for each missing word: a. Phenolphthalein is: in acidic solutions, colorless pink in neutral solutions, colorless pink in basic solutions. colorless pink b. Acidic solutions contain_ ions, and H OH H OH basic solutions contain : ions. 4. Explain why the solution being titrated first turns pink then gous endpoint is reached titrated first turns pink then goes colorless before the

Answer 1

Q1. An indicator is a substance which tells us about the chemical change in solution by changing its colour, it is the main purpose of an indicator.

It tells us that the titration is complete by changing colour.

For example phenolphthalein is a very common indicator. It is colourless in acidic solution and pink in basic solutions.

Q2. We should always dry the glassware.Firstly, it can create fluctuations in readings during weighing.Secondly, wet outter surface can produce damage to the balance.

Q3 a.. Phenolphthalein is colourless in acidic solutions and neutral solutions . It is pink in basic solutions.

b. Acidic solutions contains H⁺ ions and basic solutions contains OH^{​​​​​-} ions.