0
Reagents and Indicators R-13-
1
Analytical Methods of the Member Companies of the
Corn Refiners Association, Inc.
Accepted 4-15-86
MERCURIC NITRATE SOLUTION
PREPARATION
0.02
N Mercuric Nitrate Solution: For chloride determination. Dissolve 3.3 g of
reagent grade mercuric nitrate (Hg(NO
3)2) in about 100 mL of purified water
containing 0.25 mL of concentrated nitric acid (70% HNO
3, sp g 1.42). Dilute to
1 L with purified water, and mix.
STANDARDIZATION
Dry a quantity of analytical grade sodium chloride (NaCl) 30 minutes at 105
°C;
cool in desiccator. Dissolve 0.8241 g of dry sodium chloride in purified water,
dilute to 1 L volume, and mix.
Pipet 5.00 mL of the above sodium chloride solution, containing 2.5 mg chloride,
into each of three 250 mL glass stoppered Erlenmeyer flasks. Add 85 mL of
purified water, 10 mL of diphenylcarbazone indicator solution, 1 mL of 30%
hydrogen peroxide solution, and 1.0 mL of 0.5
N nitric acid solution (Note 1) to
each of the flasks. Stopper flasks and swirl contents. Prepare a reagent blank in a
250 mL Erlenmeyer flask containing 90 mL of purified water, 10 mL of
diphenylcarbazone indicator solution, 1 mL of 30% hydrogen peroxide solution,
and 1.0 mL of 0.5
N nitric acid solution; mix. Titrate the blank with mercuric
nitrate solution to the purple indicator end point. Color development near the end
point is slow, and as much as 30 seconds should be allowed between titrant drops
to facilitate full indicator color development (Note 2). Titrate the three standards
in the same manner to the same color end point. Observe and record the titers.
Calculate average normality.
CALCULATION
(mL Hg(NO ) Titer - Blank)×35.45
2.5mg
Normality =
3 2
Reagents and Indicators R-13-
2
MERCURIC NITRATE SOLUTION
⎯ continued
NOTES AND PRECAUTIONS
1. Treatment with hydrogen peroxide destroys interfering sulfites by oxidation
to sulfates, and the nitric acid addition adjusts acidity to the proper level
(pH about 2.5).
2. Care should be exercised as the end point is approached, and it is expedient
to observe the reaction mixture over a white surface. End point detection is
facilitated by running the blank first, and then titrating the standards to
match the color of the blank.
What else can I help you with?
How do you calculate the percent chloride with the volhard method?
To calculate the percent chloride using the Volhard method, you measure the excess silver nitrate used to titrate the chloride ions in the sample. You then use the volume of excess silver nitrate and the molarity of the silver nitrate solution to calculate the moles of chloride present. Finally, calculate the percent chloride by dividing the moles of chloride by the sample weight and multiplying by 100.
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.
What could you do to differentiate between lead nitrate and silver nitrate?
One way to differentiate between lead nitrate and silver nitrate is to add a few drops of dilute hydrochloric acid to each compound. Lead nitrate will produce a white precipitate of lead chloride, while silver nitrate will produce a white precipitate of silver chloride. Another method is to observe the color of the compounds - silver nitrate is white, while lead nitrate is colorless.
Can chloride and bromide simultaneously determine by Mohr method?
I want to assmue the the readers of this answer have know the details theory and calculations about Mohr method if not u can refer to Any analytical text for reference. Well, Bromide and Chloride can not be determine simultaneously in a sample using Mohr method , the reason be that the indicator use for each of them is different. and there will be problem in the procedure if ones try to determine both simultaneously. To determine Chloride Ion, Ammonium or Potassium Thiocynate is used as indicator and the sample must be neutral or slightly acidic. while Eosin indicator is use for the determination of Bromide Ion and the same neutral solution is prefer for this purpose, the solution must be adjusted to neutral either by adding small amount of Nitric acid or by adding small amount of carbonate as the case maybe. But, in the determination of each of them Silver Nitrate is use for the titration of both and this is the similarity they shared and the experimental procedure is quite the same. Olajire Mojeed
Explain role of nitrobenzene in volhard method?
In order to mask Ag+ions of Silver chloride, otherwise these Ag+ ions will react with thoicynate to give silver thiocynate and thus titration reading wiill be much more and chloride content will be high. UV
What any other method that can analyze chloride ion in seawater?
- Potentiometric titration with silver nitrate (AgNO3) - Titration (manual) with silver nitrate (AgNO3) or mercuric thiocyanate - Chronopotentiometry - Using ISE (Ion Selective Electrode) for Cl-
Why we used mohr method in neutralization solution?
The Mohr method is used in neutralization solutions to determine the concentration of chloride ions or substances that can be precipitated as silver chloride. By titrating the solution with a standardized silver nitrate solution using a chromate indicator, the endpoint is reached when all chloride ions have reacted to form a white precipitate. This method allows for accurate determination of chloride concentration in solution.
How do you calculate the percent chloride with the volhard method?
To calculate the percent chloride using the Volhard method, you measure the excess silver nitrate used to titrate the chloride ions in the sample. You then use the volume of excess silver nitrate and the molarity of the silver nitrate solution to calculate the moles of chloride present. Finally, calculate the percent chloride by dividing the moles of chloride by the sample weight and multiplying by 100.
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.
Titration involving bismuth sulfate and Titration involving mercuric nitrate?
Titration involving bismuth sulfate would typically be used to determine the concentration of a solution of a known or unknown substance that can react with bismuth ions. On the other hand, titration involving mercuric nitrate would be suited for determining the concentration of substances that can react with mercuric ions. Each titration method is specific to the ions involved and the chemical reactions occurring.
Why is silver nitrate used to determine salinity?
AgNO3 dissociates into Ag+ and NO3- ions in water and from these Ag+ions combine with Cl- in saline water (from ionised NaCl or CaCl2) to form the white AgCl precipitate.So from the amount of AgNO3 consumed we can find Chloride content of water, which mostly correspondenses with salinity.The nitrate ions are not reacting (all nitrates are/stay soluble, thus ionised)
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 could you detect the presence of chloride negative ion?
One common method to detect the presence of chloride ions is through a silver nitrate solution. When silver nitrate is added to a sample containing chloride ions, a white precipitate of silver chloride forms. Another method is ion chromatography, which can separate and detect chloride ions based on their different migration times in a chromatographic column.
What happens when you add silver nitrate solution to chloride solution?
When you add silver nitrate solution to a chloride solution, a white precipitate of silver chloride forms. This reaction is a chemical method for detecting the presence of chloride ions. Silver chloride is insoluble in water and forms as a solid that can be filtered out of the solution.
How could you tell the difference between an iron chloride and sodium chloride solution?
One way to differentiate between iron chloride and sodium chloride solutions is to perform a chemical test using silver nitrate. Iron chloride solution will form a white precipitate of silver chloride, while sodium chloride solution will not react with silver nitrate. Another method is to use a flame test: iron chloride imparts a yellow color to the flame, while sodium chloride does not.
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-.
How can you determine the chloride in soap?
If the soap is fully and completely water soluble, its chloride content can be precipitated by adding silver nitrate solution to the soap solution, and the amount of silver chloride solution used until precipitation ceases measures the content of sodium originally in the solution. There are also many other analytical methods available.
