Viva Voce – Questions on Titration Practicals

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  • 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.

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

  1. It is really use full us for scoring fullmark in practical examination ,,,,thank you so much,..expecting much more

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