Question

4) AgNO3 used as precipitating agent in Mohr's method against
marks)
(1
NaOH
HCL
Naci
kMn04​

Answer 1

Answer:

kMn04

Explanation:

The chloride ion concentration of the MgCl2 and CaCl2 solutions is determined by a precipitation titration with calibrated silver nitrate solution. This procedure is known as Mohr's method

Answer 2

Answer:

$AgNO_{3}$  Silver nitrate used as precipitating agent in Mohr's method against Sodium chloride$NaCl.$

Explanation:

• Mohr's method is additionally called the argentometric method.
• It is a titration method during which silver compound is employed as standard to analyse chloride ion concentration.
• Silver nitrate reacts with common salt within the presence of the potassium chromate as an indicator. As a results of the reaction chloride precipitates get into the shape of white precipitate (primary precipitate) and nitrate are the by-product.

$AgNO_{3}+NaCl \longrightarrow AgCl+NaNO_{3}$

• The pH maintained within the mohr's method is neutral (pH = 7).
• Silver chloride precipitates early thanks to its lower ionic value.
• Once the caustic gets completely reacted with common salt then it reacts with the indicator (potassium chromate).
• Silver nitrate reacts with potassium chromate and forms silver chromate which converts white precipitate into Venetian red precipitate (secondary precipitate) which is that the end point of the mohr's method.

$2AgNO_{3}+K_{2}CrO_{4} \longrightarrow Ag_{2}CrO_{4}+2KNO_{3}$

• All the halogen compounds are often analyzed by mohr's method except Iodine compounds because iodine forms primary burnt sienna precipitate therefore the top point can not be determined.

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