Equilibrium

Equilibrium

Question

An alkali is titrated against an acid with methyl orange as indicator, which of the following is a correct combination?

  • Base Acid End Point
    Strong  Strong Pink to colourless
  • Base Acid End Point
    Weak  Strong Colourless to pink
  • Base Acid End Point
    Strong  Strong Pinkish Red to Yellow
  •  

    Base Acid End Point
    Weak Strong Yellow to Pinkish Red

Answer

D.

 

Base Acid End Point
Weak Strong Yellow to Pinkish Red

Methyl orange is the weak organic base. It is used in the titration of WB vs SA

MeOHUnionized form Yellow  Me+ Ionized form (Red)+ OH-

In a basic medium, equilibrium lies in the backward direction and therefore it shows yellow colour.

In acidic medium, equilibrium shifts in forwarding direction and therefore, colour changes from yellow to red.

More Chapters from Equilibrium