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A mixture containing 0.05 mol of K(2)Cr(...

A mixture containing 0.05 mol of `K_(2)Cr_(2)O_(7)` and 0.02 mol of `KMnO_(4)` was treated with excess of KI in acidic medium.The liberated iodine required 2.0 L of `Na_(2)SO_(3)` solution of titration. Concentration of `Na_(2)S_(2)O_(3)` solution was

A

14.64

B

34.2

C

65.69

D

50

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One gram of a mixture of KMnO_(4) and K_(2)Cr_(2)O_(7) was treated with excess Kl in acid solution. The liberated iodine requred 200mL of 0.15N hypo for titration. Calculate the pracentage weight of potassium permanganate in the mixture.

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Knowledge Check

  • 50 ml of given H_(2)O_(2) solution is added to excess KI solution in acidic medium. The liberated I_(2) required 20 ml of 0.04 M standard Hypo solution. Molarity of H_(2)O_(2) solution is

    A
    `8xx10^(-3)M`
    B
    `4xx10^(-3)M`
    C
    `5xx10^(-3)M`
    D
    None of these

  • 50 ml of given H_(2)O_(2) solution is added to excess KI solution in acidic medium. The liberated I_(2) requires 20 ml of 0.04 M standard Hypo solution. Molarity of H_(2)O_(2) solution is

    A
    `8xx10^(-3)M`
    B
    `4xx10^(-3)M`
    C
    `5xx10^(-3)M`
    D
    None of these

  • Some amount of ..20V.. H_(2)O_(2) is mixed with excess of acidifeid solution KI. The iodine so liberated required 200ml of 0.IN Na_(2)S_(2)O_3 for tritration. The volume of H_2O_2 solution is

    A
    11.2 ml
    B
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    C
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    D
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    50 ml of given H_(2)O_(2) solution is added to excess KI solution in acidic medium. The liberated I_(2) requires 20 ml of 0.04 M standard Hypo solution. The strength of given 250 m H_(2)O_(2) solution is

    Iodine titration can be iodemotire or iodimetric depending on using iodine directly or indirectly as an oxidising agent in the redox titration. a) Iodimetric titration in which a standard iodine solution is used as an oxidant and iodine is directly or indirectly titrated against a reducing agent. For example 2CuSO_(4)+4KIrarrCu_(2)I_(2)+2K_(2)SO_(4)+I_(2) b) Iodimetric procedures are used for the determination of strength of reducing agent such as thiosulphates, sulphites, arsenties and stannous chloride etc., by titrating them against standard solution of iodine in a burette. 2Na_(2)S_(2)O_(3)rarr2NaI+Na_(2)S_(4)O_(6) Starch is used as indicator near the end point which form blue colour complex with I_(3)^(-) . The blue colour disappeams when there is no more of free I_(2) . When 319.0 gm of CuSO_(4) in a solution is related with excess of 0.5 M KI solution, then librated iodine required 200 ml of 1.0 M Na_(2)S_(2)O_(3) for complete relation. The percentage purity of CuSO_(4) in the sample is

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    There are two types of iodine titrations (a) Iodometric & (b) Iodimetric, Iodometric method is indirect method of I_(2) estimation. Any oxidant which liberates I_(2) from KI solution, the liberated iodine is estimated by titrating it with Na_(2)S_(2)O_(3) solution as : I_(2)+2Na_(2)S_(2)O_(3)rarr2NaI+Na_(2)S_(4)O_(6) 100 mL of .x. M K_(2)Cr_(2)O_(7) solution is added to excess of KI solution in acidic medium. The liberated iodine required 50 mL of 0.1N Na_(2)S_(2)O_(3) solution. The value of x is

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