Question

17. When you use universal indicator, you see that solutions
of different acids produce different colours. Indeed,
solutions of the same acid with different concentrations
will also give different colours. Why?​

Answer 1

Answer:

A universal indicator is a mixture of dyes which identify a gradual change of various colours over a wide range of pH,  

depending on the strength of the acid. When we use a universal indicator, we see solutions of different acids produce  

different colours. Indeed, solutions of the same acid with different concentration give different colours.  

The more acidic solutions turn universal indicator bright red. A less acidic solution will only turn it orange-yellow. Colour  differences can also be observed in case of vinegar which is less acidic and battery acid which is more acidic.

Hope this helps you.. :)