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AS silver ions first react with Cloride ions in the sample(equivalence point) and when all the chloride ions are consumed we have to add more silver nitrate solution to increase its concentration to a level where it can precipitate chromate ions as silver chromate precipites (reddish brown ppts) this is the end point . so remove this error of equivalence point detection we take the same volume of indicator (chromate solution) in a flask labelled blank and add water into this flask (the same volume as that of sample solution) and then titrate this blank labelled flask with standard silver nitrate solution and note the volume of titrant consumed (blank volume),then calculations for real equivalence point can be made as:
equivalence point=(end point)-(blank volume)
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Why is not possible to determine iodide by mohr titration?
Iodide cannot be determined by Mohr titration because it does not form a precipitate with silver nitrate. Mohr titration relies on the formation of a colored precipitate to indicate the end point, which is not observed in the case of iodide ions. Other methods, such as iodometric titration or spectrophotometry, are used to determine iodide ions quantitatively.
Why in Mohrs method of titration pH is maintain as neutral?
In Mohr's method of titration, the pH is maintained as neutral in order to ensure that the indicator used in the titration changes color sharply at the equivalence point. This helps in accurately determining the end point of the titration, as the color change will be clearly visible when the reaction is complete. Maintaining a neutral pH also prevents any interference from acidic or basic impurities that could affect the accuracy of the titration.
What is the use of ferroin indicator in redox titration of Mohr's salt?
Ferroin indicator is used in the redox titration of Mohr's salt as it changes color when the Fe2+ ions are completely oxidized to Fe3+ ions. This color change helps in determining the end point of the titration, where all the Mohr's salt has been oxidized and no more Fe2+ ions are present.
Why HCl is used in titration of mohr salt and potassium dichromate?
Hydrochloric acid (HCl) is used in the titration of Mohr's salt and potassium dichromate because it reacts with Mohr's salt to form ferric chloride and with potassium dichromate to form chromium chloride. These reactions result in the formation of a color change in the solution which allows for the end point of the titration to be easily detected.
Why Mohr salt is called Mohr?
Mohr salt is named after the German chemist Karl Friedrich Mohr, who first synthesized it in 1855. He discovered the compound's chemical composition and properties that are frequently used in analytical chemistry and titration methods.
Why indicator blank is used in mohr method?
An indicator blank is used in the Mohr method to account for any color changes that may occur due to impurities in the indicator itself. By measuring the blank, you can subtract this error from the titration result, ensuring accurate determination of the analyte concentration.
I.Explain why it is necessary to do a blank titration during Mohr titration?
A blank titration is necessary during a Mohr titration to account for any potential interference or background color changes that may occur in the titration process. It helps establish a baseline by determining the volume of titrant required to reach the endpoint in the absence of the analyte. This ensures that the results obtained from the actual titration accurately reflect the concentration of the analyte being measured, without the influence of extraneous factors. By subtracting the blank titration volume from the total volume used in the actual titration, the final results are more reliable and precise.
Why is argentrometric method called as a mohr method?
The argentometric method is called the Mohr method because it was developed by the German chemist Karl Friedrich Mohr in the 19th century. This titration technique involves the use of silver nitrate as a titrant and is specifically used for the determination of chloride ions in a solution. The method is characterized by the formation of a colored precipitate (silver chromate) at the endpoint, which occurs when all chloride ions have reacted, indicating the completion of the titration.
Why is not possible to determine iodide by mohr titration?
Iodide cannot be determined by Mohr titration because it does not form a precipitate with silver nitrate. Mohr titration relies on the formation of a colored precipitate to indicate the end point, which is not observed in the case of iodide ions. Other methods, such as iodometric titration or spectrophotometry, are used to determine iodide ions quantitatively.
Why we add conc sulphuric acid in mohr salt in the titration of mohr salt against potassium dichromate?
For preparation of standard solution of Mohr salt {FeSO4.(NH4)2SO4.6H2O}, it's necessary to add dilute H2SO4 to prevent the Fe2+ ions of Mohr salt solution from undergoing oxidation (to Fe3+).
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.
Why in Mohrs method of titration pH is maintain as neutral?
In Mohr's method of titration, the pH is maintained as neutral in order to ensure that the indicator used in the titration changes color sharply at the equivalence point. This helps in accurately determining the end point of the titration, as the color change will be clearly visible when the reaction is complete. Maintaining a neutral pH also prevents any interference from acidic or basic impurities that could affect the accuracy of the titration.
What is the use of ferroin indicator in redox titration of Mohr's salt?
Ferroin indicator is used in the redox titration of Mohr's salt as it changes color when the Fe2+ ions are completely oxidized to Fe3+ ions. This color change helps in determining the end point of the titration, where all the Mohr's salt has been oxidized and no more Fe2+ ions are present.
Why HCl is used in titration of mohr salt and potassium dichromate?
Hydrochloric acid (HCl) is used in the titration of Mohr's salt and potassium dichromate because it reacts with Mohr's salt to form ferric chloride and with potassium dichromate to form chromium chloride. These reactions result in the formation of a color change in the solution which allows for the end point of the titration to be easily detected.
What is the equivalent weight of mohr's salt in the titration of pottasium permanganate and mohr's salt?
The equivalent weight of Mohr's salt (ammonium iron(II) sulfate) is the molecular weight divided by the total positive charge of the cation(s) that are being titrated. In the titration of potassium permanganate with Mohr's salt, the equivalent weight of Mohr's salt is 88 g/mol (molecular weight) divided by the total positive charge of the cation(s) (in this case, 2), which equals 44 g/equivalent.
What are the limits for determination of chloride by the Mohr method?
1- done only in neutral medium. 2- all the cations which give insolublld be chromate must be absent or removed before titration. 3-titration of Ag+ with Cl- is not feasible. 4- not suitable for I- and SCN-
Why Mohr salt is called Mohr?
Mohr salt is named after the German chemist Karl Friedrich Mohr, who first synthesized it in 1855. He discovered the compound's chemical composition and properties that are frequently used in analytical chemistry and titration methods.
