Home
Class 11
CHEMISTRY
A 0.276 g impure sample of copper ore is...

A 0.276 g impure sample of copper ore is dissolved and `Cu^(2+)` is titrated with KI solution. `I_(2)` liberated required 40 mL of 0.1 M `Na_(2)` `S_(2)` `O_(3)` solution for titration. What is the % of impurities in the ore ?

Text Solution

Verified by Experts

The correct Answer is:
8
Promotional Banner

Topper's Solved these Questions

  • STOICHIOMETRY

    NARENDRA AWASTHI|Exercise Level 3 - Assertion - Reason Type Questions|15 Videos

  • SOLID STATE

    NARENDRA AWASTHI|Exercise Level 3 - Subjective Problems|1 Videos

  • THERMODYNAMICS

    NARENDRA AWASTHI|Exercise Level 3 - Match The Column|2 Videos

Similar Questions

Explore conceptually related problems

To 50ml of 0.1 N Na -(2) CO_(3) solution 150ml of water is added . What is the molarity of result solution ?

50 ml solution of H_(2)O_(2) was treated with excess KI (s) and the solution was acidified with acetic acid. The liberated I_(2) required 40 ml of 0.5 M Na_(2)S_(2)O_(3) solution for the end point using starch is indicator. Find the molairty and volume strength of the H_(2)O_(2) solution.

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

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

All titration which involves the direct titration of Iodine with a reducing agent are grouped under lodimetry. Iodimetry is employed to determine the strength of reducing agent such as sodium thio sulphate I_(2) + 2Na_(2)S_(2)O_(3) rarr 2I^(-)+S_(4)O_(6)^(-) If iodine is liberated as a result of chemical reaction involving oxidation of an idodide ion by a strong oxidizing agent in neutral or acidic medium the liberated iodine is then titrated with reducing agent. This titration is called lodometry. Todometry is used to estimate the strength of oxidizing agent. For example the estimation of Cu^(++) with thiosulphate. Cu^(+ +) +I^(-) Cu_(2)I_(2)+I_(2) , I_(2) +S_(2)O_(3)^(-) rarrS_(4)O_(6)^(-) +I^(-) Starch used as indicator near the end point which form blue colour complex with I_(3)^(-) . The blue colour disappears when When 159.50g of CuSO_4 in a solution is reacted with KI, then the liberated iodine required 100 ml 1 M Na_(2)S_(2)O_3 for complete reaction, then what is the percentage purity of sample used in making the solution.

Iodine titration can be iodemotric or iodimetric depending on using iodine directly or indirectly is 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)+4KJtoCu_(2)I_(2)+2K_(2)SO_(4)+I_(2) b. Iodimetric procedures are used for the datermination of strength of reducing agent such as thiosulphates, sulphites, arsenties adn stanous chloride etc. by titrating them against standard solution of iodine in a burette. 2Na_(2)SO_(3)to2 NaI +Na_(2)S_(4)O_(6) Starch is used as indicator near the end point whilch form blue colour complex with I_(3)^(-) . The blue colour disappeams when there is not 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 1.0M Na_(2)S_(2)O_(3) for complete relation. The percentage purity of CuSO_(4) in the sample is

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 O_2 at STP that would be linerated above H_2O_2 solution :

NARENDRA AWASTHI-STOICHIOMETRY-Level 3 - Subjective Problems
  1. What volume of a liquid (in L) will contain 10 mole ? If molar mass of...

    Text Solution

    |

  2. 16 g of SO(x) gas occupies 5.6 L at 1 atm and 273 K.What will be the v...

    Text Solution

    |

  3. 200 mL of 1M HCl, is mixed with 300 mL of 6 M and the final solution i...

    Text Solution

    |

  4. N(2)(g) reacts with H(2)(g) in either of the following ways depending ...

    Text Solution

    |

  5. One commercial system removes SO(2) emission from smoke at 95(@)C by t...

    Text Solution

    |

  6. W is the mass of iron (in g) which will be converted into Fe(3)O(4) by...

    Text Solution

    |

  7. Calculate the total moles of atoms of each element present in 122.5 g ...

    Text Solution

    |

  8. On dissolving 2.0 g of metal in sulphuric acid ,4.51 g of the metal su...

    Text Solution

    |

  9. One gram of a metallic chloride was found to contain 0.835 g of chlori...

    Text Solution

    |

  10. 0.7875 g of crystalline barium hydroxide is dissolved in water .For th...

    Text Solution

    |

  11. 2.0 g of polybasic organic acid (Molecular mass =600) required 100 mL ...

    Text Solution

    |

  12. A mixture contains 1.0 mole each of NaOH,Na(2)CO(3) and NaHCO(3). When...

    Text Solution

    |

  13. When BrO(3)^(-) ion reacts with Br^(-) ion in acidic medium, Br(2) is ...

    Text Solution

    |

  14. A volume of 12.5 mL of 0.05 M SeO(2) reacts with 25 mL of 0.1 M CrSO(4...

    Text Solution

    |

  15. A 0.276 g impure sample of copper ore is dissolved and Cu^(2+) is titr...

    Text Solution

    |

  16. A sample of 28 mL of H(2) O(2) (aq) solution required 10 mL of 0.1 M K...

    Text Solution

    |

  17. For the redox reaction given, what is the value of (x)/(z) ? xNO(3)^...

    Text Solution

    |

  18. On heating 0.220 g of a metallic oxide in presence of hydrogen,0.045 g...

    Text Solution

    |

  19. 10 g mixture of K(2)Cr(2)O(7) and KMnO(4) was treated with excess of K...

    Text Solution

    |

  20. In an ore, the only oxidizable material is Sn^(2+). This ore is titrat...

    Text Solution

    |