Question

Which cation cannot be titrated using complexometric titration ?

1 point

Li+

Zn2+

Ca2+

Mg2+​

Answer 1

Answer:

ca2+ is the right answer

Answer 2

Cations titrated using complexometric titration.

Explanation:

• Complexometric titration is a volumetric titration in which  a colored complex is formed which is used to indicate the end point of titration.
• This type of titration is very useful in determining the mixture containing different metal ions which is present in the solution.
• Alkali metals and alkaline earth metals cannot be titrated by this titration because of their high ionic radius and hardness property
• According to hard-soft acid-base theory , their hardness property is against the soft carboxylate which makes the chelation less favorable.
• So, complexes cannot formed with alkali and alkaline earth metals.

So, that is why metal Lithium ion is not titrated by complexometric titration whereas zinc ion, Calcium ion, Magnesium ion can be titrated by complexometric titration.