Question 1 What are universal indicators?
Question 2 For what purpose a universal indicator is used?
Question 3 Water is neutral.What colour will you get when you add few drops of universal indicator to a a test tube containing water?
Question 4 A solution X and Y is tested with universal indicator. X turns orange whereas Y turns red.Which solution is a stronger acid?
The common indicator cannot tell us the relative strength (strong or weak) of an acid or a base.
To measure the strength of an acid or a base solution we use universal indicators.
Universal indicator is a mixture of many indicators which gives diferent colours at different pH values of entire scale.
It shows different colours at different concentration of ions in the solution.
A drop of the solution to be tested is put on a strip of universal indicator paper.It then undergoes a colour change.The colour produced us then matched with a colour on pH colour chart.We then read the pH value corresponding to this colour from pH colour chart.After knowing pH value we can tell whether the given solution is a weak or strong acid or base.