Redox tritation

Question 1

Are volumetric methods,based on oxidation/reduction reactions.According to the oxidizingagent used for titration,these methodsmaybedividedinto

Answer 1

Permanganometry
Iodometry
Bromatometry
Chromatometry
Cerimetry
Vanadatometry

Question 2

As working solution,standardizedKMnO4solutionis used . In storage, its concentration changes under the influence of the environment. Therefore KMnO4solutionis prepared of approximately0.05 N, and before the work the concentration is standardized against the standard solution of ______

Answer 2

oxalic acid

Permangonometry

Question 3

Further on, the reaction proceeds smoothly,because Mn2+ ions produced act as catalysts. This phenomenon is called ______. In acid medium,the purpleMnO4- ion is reduced to ___

Answer 3

autocatalysis

colorless Mn2+ion

Question 4

excess of the reductant is then titrated by working solution of KMnO4. Such an indirect titration is called ______

Answer 4

retitration.

Question 5

By the permanganometry, it is possible to determine the amounts of the following substances:

Answer 5

Nitrites, thiocyanates, hydrogen peroxide, ferroussalts, aldehydes, carboxylic and hydroxyacids and their salts

Question 5

By the permanganometry, it is possible to determine the amounts of the following substances:

Answer 5

Nitrites, thiocyanates, hydrogen peroxide, ferrous salts, aldehydes, carboxylic and hydroxy acids and their salts

Question 6

_______ allows determination of amounts of both reductant and oxidant.

Answer 6

Iodometry

Question 7

titrationis carriedout usingiodinesolution,whichispreparedby weighingiodinecrystals,purifiedby sublimation. In this case,the reactionproceedsto the right

Answer 7

Fordeterminationofreductant

Question 8

the solutionto be analyzedis reactedwithI- ions inexcess; in this stagethe partof I- ions,whichis equivalentto the amountof theanalyzedoxidant,is oxidizedto free iodine(I2), i.e. the reactionproceedsto the left . I2producedis thentitratedby the solutionof thiosulfate

Answer 8

for determination of oxidant

Question 9

. Titration is carriedout until the single drop of Na2S2O3 makesthe solution colorless. Iodometry finds wide application for determination of oxidizingagents______-and reducingagents_____

Answer 9

chromates,hypochlorites,freehalides,

sulfides,sulfites,arsenicions.

Question 10

Bothproductsof the reactionhaveno color,thereforefor the detectionof the equivalencepoint0.05- 0.1 % _____

Answer 10

Starch solution is used

Sodium thiosulfate is used colorless