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It is an indirect titration procedure for the determination of anions that precipitate with silver like CL-, Br-, I-, SCN-, and it is preferred in acid (HNO3) solution (because it prevents the harmful effects seen in other methods in which oxalate, arsenate and carbonate are used. Because these ions form silver salts with poor solubility, but in acidic mediums these salts are not formed). A measured excess of AgNO3 is added to precipitate the anion, and the excess of Ag+ is determined by back titration with standard potassium thiocyanate solution.
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Why mohr method is better than volhard method?
The Mohr method is typically preferred over the Volhard method for chloride titrations because it does not require a silver nitrate standard solution, making it more cost-effective and simpler to execute. Additionally, the Mohr method is more precise as it allows for a direct endpoint determination based on the formation of a specific silver chloride precipitate.
Why is an acidic titration medium a requirement of the vol hard?
An acidic titration medium is required in a Volhard method for chloride determination because it prevents the precipitation of silver chloride as a solid. Keeping the solution acidic ensures that the silver chloride formed during the titration remains in solution as AgCl^- ions, allowing for accurate measurement of the endpoint.
Why nitric acid is used in volhard method?
Nitric acid is used in the Volhard method to oxidize Fe(II) to Fe(III) in order to prevent interference in the titration of chloride ions with silver nitrate. By converting Fe(II) to Fe(III), nitric acid ensures accurate and precise results in the determination of chloride content.
What is the purpose of adding nitrobenzene in volhard titration?
Nitrobenzene is added in volhard titration as an indicator to detect the endpoint of the titration between chloride ions and silver ions. It forms a red-brown complex with excess silver ions which marks the end point of the titration.
Why is back titration required in the volhard method?
This method uses a back titration with potassium thiocyanate to determine the concentration of chloride ions in a solution.Before the titration an excess volume of a standardized silver nitrate solution is added to the solution containing chloride ions, forming a precipitate of silver chloride (AgCl). The term 'excess' is used as the moles of silver nitrate added are known to exceed the moles of sodium chloride present in the sample so that all the chloride ions present will react.Ag+ + Cl- AgCl(s) (Ksp = 1.70 × 10−10)Excess WhiteExcess of Ag+ is back titrated with SCN-.
When was Franz Volhard born?
Franz Volhard was born in 1872.
When did Franz Volhard die?
Franz Volhard died in 1950.
Why mohr method is better than volhard method?
The Mohr method is typically preferred over the Volhard method for chloride titrations because it does not require a silver nitrate standard solution, making it more cost-effective and simpler to execute. Additionally, the Mohr method is more precise as it allows for a direct endpoint determination based on the formation of a specific silver chloride precipitate.
What is the difference between volhard and mohr methods?
The Volhard method is a titration method used to determine the concentration of halide ions in a solution using silver nitrate and potassium chromate as indicators. The Mohr method, on the other hand, is also a titration method used to determine the chloride ions concentration in a solution using silver nitrate and potassium chromate indicators. The key difference lies in the end point detection: Volhard method involves the use of a ferric alum indicator that forms a red-brown precipitate, while the Mohr method involves the formation of a red-brown silver chromate precipitate.
When did Jacob Volhard die?
Jacob Volhard died on 1910-01-14.
When was Jacob Volhard born?
Jacob Volhard was born on 1834-06-04.
What has the author Jakob Volhard written?
Jakob Volhard has written: 'Justus von Liebig'
What is Christiane Nüsslein-Volhard's birthday?
Christiane Nüsslein-Volhard was born on October 20, 1942.
When was Christiane Nüsslein-Volhard born?
Christiane Nüsslein-Volhard was born on October 20, 1942.
What is the limits for determination chloride by Volhard method?
The Volhard method is typically used to determine chloride concentrations ranging from 1-30 mg/L in water samples. This method involves titrating a silver nitrate solution with a potassium thiocyanate solution in the presence of a ferric indicator until a reddish-brown color change occurs.
How old is Christiane Nüsslein-Volhard?
Christiane Nüsslein-Volhard is 68 years old (birthdate: October 20, 1942).
What Nobel Prize did Christiane Nusslein Volhard win and when was it awarded?
Christiane Nusslein-Volhard won The Nobel Prize in Physiology or Medicine in 1995.
