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Related Concept Videos

Precipitation Gravimetry01:03

Precipitation Gravimetry

8.0K
Precipitation gravimetry is based on converting an analyte into a sparingly soluble precipitate, which is separated by filtration and weighed. An ideal precipitate should be pure, insoluble, of known composition, and easily filtered from the reaction mixture.
In determining nickel by gravimetric analysis, a precipitant of ethanolic dimethylglyoxime is added to a hot nickel salt solution. This is quickly followed by the dropwise addition of dilute ammonia solution until precipitation occurs. A...
8.0K
Precipitation Titration Curve: Analysis01:21

Precipitation Titration Curve: Analysis

1.3K
The precipitation titration curve demonstrates the change in concentration of one reactant with the volume of titrant added. During the titration of chloride ions with silver nitrate, the precipitation titration curve is divided into three regions: before, at, and after the equivalence point. Before the equivalence point, low redissolution of the sparingly soluble silver chloride precipitate gives a low silver ion concentration. However, in the second region, representing the equivalence point,...
1.3K
Washing, Drying, and Ignition of Precipitates00:52

Washing, Drying, and Ignition of Precipitates

1.2K
After filtration, the precipitate is washed to remove coprecipitated impurities and any remaining mother liquor. Colloidal precipitates, such as silver chloride, are washed with an electrolyte (such as dilute nitric acid) to prevent the peptization of the precipitate. In the case of slightly soluble precipitates, the wash solution contains a common ion to reduce solubility. Lead sulfate, which is slightly soluble in water, is washed with dilute sulfuric acid. Similarly, wash solutions may be...
1.2K
Sample Preparation for Analysis: Advanced Techniques01:08

Sample Preparation for Analysis: Advanced Techniques

502
Accurate analysis of complex samples often requires advanced preparation techniques to achieve reliable and reproducible results. Samples containing inorganic or organic materials can be challenging to dissolve or decompose effectively. Standard sample preparation methods include acid digestion, fusion, dry ashing, and wet digestion.
Acid digestion with strong acids is commonly used to dissolve inorganic materials that are insoluble (do not dissolve) in water. This method can be useful for...
502
Colloidal precipitates01:09

Colloidal precipitates

882
The high insolubility of some precipitates can result in an unfavorable relative supersaturation. This can lead to colloidal particles with a large surface-to-mass ratio, where adsorption is promoted. For instance, in the precipitation of silver chloride, silver ions are adsorbed on the surface of the colloidal particles, forming a primary layer. This layer attracts ions of opposite charge (such as nitrate ions), forming a diffuse secondary layer of adsorbed ions. This electric double layer...
882
Precipitation Titration: Endpoint Detection Methods01:19

Precipitation Titration: Endpoint Detection Methods

2.3K
In argentometric precipitation titrations, endpoints can be detected visually by the Mohr, Volhard, and Fajans methods. In the Mohr method, adding a soluble chromate indicator gives an initial yellow color to the analyte solution. As the titrant is added, the first excess of silver ions forms a red silver chromate precipitate, marking the endpoint. The solution pH should be maintained at about 8 by adding solid CaCO3.
In the Volhard method, a standard excess of AgNO3 is first added to the...
2.3K

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Tangential Flow Ultrafiltration: A &ldquo;Green&rdquo; Method for the Size Selection and Concentration of Colloidal Silver Nanoparticles
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Tangential Flow Ultrafiltration: A “Green” Method for the Size Selection and Concentration of Colloidal Silver Nanoparticles

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A Novel Method for Analyzing Silver Sediment With High Precision.

R S Davis1, V E Bower1

  • 1Center for Absolute Physical Quantities, National Bureau of Standards, Washington, DC 20234.

Journal of Research of the National Bureau of Standards (1977)
|December 9, 2021
PubMed
Summary
This summary is machine-generated.

A new method accurately recovers silver residue from silver coulometers, improving electrochemical determination of the Faraday constant. This technique electrochemically plates silver, offering enhanced precision for fundamental constant measurements.

Keywords:
Controlled potentialFaradaycoulometryelectrochemical equivalent of silverelectrochemistypotentiostatsilversilver analysis

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Area of Science:

  • Electrochemistry
  • Metrology
  • Analytical Chemistry

Background:

  • Accurate determination of fundamental physical constants, such as the Faraday constant, is crucial for scientific advancement.
  • Traditional silver coulometry for Faraday constant determination is limited by challenges in accurately recovering anode silver residue.
  • Previous residue recovery methods relied on direct weighing, which can be prone to significant errors.

Purpose of the Study:

  • To develop and validate a novel technique for the precise recovery of silver residue from silver coulometers.
  • To enhance the accuracy of electrochemical determinations of the Faraday constant by improving residue analysis.
  • To establish a more reliable method for quantifying small amounts of silver.

Main Methods:

  • A new technique converts anode silver residue into silver ions in solution.
  • Electrodeposition of silver ions onto a cathode at a controlled potential relative to a reference electrode.
  • Electronic integration of the electrolysis current to quantify the recovered silver.

Main Results:

  • The developed technique achieves a high degree of accuracy in silver residue recovery.
  • An overall standard deviation of 5 μg was obtained for sample sizes between 400 μg and 1.8 mg.
  • This method overcomes limitations associated with the direct weighing of silver residue.

Conclusions:

  • The novel electrochemical recovery technique is sufficiently accurate to aid in the determination of the Faraday constant.
  • This method provides a significant improvement over previous techniques for silver residue analysis in coulometry.
  • The enhanced precision in residue recovery contributes to more accurate metrological measurements.