Viva Voce – Questions on Titration Practicals

Spread the love

  • Why is diluted sulphuric acid [H2SO4] added while preparing standard Mohr’s solution?

It is added to prevent hydrolysis of ferrous salt.

  • Can you use hydrochloric acid [HCl] or nitric acid [HNO3] in potassium permanganate [KMNO4] titrations? Why?

No. HNO3 is itself an oxidising agent whereas HCl being oxidisable to chlorine and hydrogen consumes permanganate.

  • What is the oxidation number of manganese in potassium permanganate [KMNO4] ?

Oxidation number of manganese in KMNO4 is 7.

  • Why are hot solutions not poured into graduated apparatus like durette, measuring flask etc.?

Hot solutions may expand glass and thereby introduce errors in volume measurement.

  • Why do we heat the oxalic acid to 60o– 70o C?

Heating is done to enhance the rate of reaction and increase activation energy.

  • What happens if we heat oxalic acid above 100o C?

It may decompose oxalic acid into carbon dioxide [CO2] and carbon monoxide [CO].

  • What is autocatalysis?

The reaction in which product acts as a catalyst to the reaction.

  • Should a titration flask also be rinsed?

No, rinsing of the flask will increase the volume more than pipetted one.

You can also get Class XII Practicals on BiologyPhysics, and Physical Education.


Spread the love

17 Replies to “Viva Voce – Questions on Titration Practicals”

Leave a Reply

Your email address will not be published. Required fields are marked *