Name two acid base indicators?

Which one of the following can be used as an acid base indicator by a visually impared student?

Age of pyramid with broad base indicates

What is name of mixture of various indicators?

An acid-base indicator which is a weak acid has a pK_(In) value =5.45. At what concentration ratio of sodium acetate to acctic acid would the indicator show a colour half-way between those of its acid and conjugate base forms ? [pK_(a) of acetic acid =4.75, log 2=0.3]

Name the acid and the base which from the salts: Sodium chloride.

Name the acid and the base which from the salts: Ammonium chloride.

An acid-base indicator has a K_(a) of 3.0 xx 10^(-5) . The acid form of the indicator is red and the basic form is blue. (a) By how much must the pH change in order to change the indicator from 75% red to 75% blue?

Name the acid and base from which the salt CuSO_4 has been derived.