(a)

How is a universal indicator better than litmus solution ?

(b)

State two features of pH scale.

(c)

Why should we not add water to a concentrated acid ?

(a) Universal Indicator gives a wide range of colours of acids and bases whereas Litmus solution only one colour change. / Universal indicator gives the strength of acids/bases, Litmus does not.

(b)

(c) If water is added to concentrated acid, the heat generated may cause the mixture to splash out and cause burns / excess heat is generated.