Define (i) salt (ii) normal salt (iii) acid salt – with relevant examples and equations.

Define pH value. What would you say about the pH of a solution in which

(i) H⁺ aq. ions = OH^- ions

(ii) evolves CO₂ when heated with Na₂CO₃

(iii) OH^-ions > H⁺ aq. ions.

State whether litmus is a common acid-base indicator or a universal indicator.

State the colour change in a universal indicator e.g. pH paper on

(i) slightly acidic soil

(ii) slightly alkaline soil

(iii) dairy milk

(iv) human blood tested for medical diagnosis.