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Precipitation Titration: Endpoint Detection Methods01:19

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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.
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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,...
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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.
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Precipitation titration involves the reaction of a titrant and an analyte to generate an insoluble precipitate. While precipitation titration uses various precipitating agents, silver nitrate is the most common precipitating reagent; titrations involving Ag+ are called argentometric titrations. Usually, the endpoint in a precipitation titration can be detected by visual indicators.
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When the quality of water for concrete preparation is uncertain, its impact on the setting time of cement and compressive strength of mortar is assessed by comparison with de-ionized or distilled water benchmarks. American Society for Testing and Materials (ASTM) C1602 requires the setting times to be within 90 minutes of the control, British Standard (BS) 3146:1980 allows a 30-minute variance in the initial setting, while British Standards European Norm (BS EN) 1008 specifies initial setting...
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Development of a Standard Reference Material for Rainwater Analysis.

William F Koch1, George Marinenko1, Robert C Paule1

  • 1National Bureau of Standards, Gaithersburg, MD 20899.

Journal of Research of the National Bureau of Standards (1977)
|August 4, 2021
PubMed
Summary

A new Standard Reference Material (SRM) 2694, "Simulated Rainwater," was developed to improve acidic rainfall analysis. This material aids in accurately measuring key components in environmental monitoring.

Keywords:
Standard Reference Materialacid rainacidityammoniumanalytical chemistryconductivitymeasurementpHprecipitationrainwaterstatisticssulfate

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Area of Science:

  • Environmental Science
  • Analytical Chemistry
  • Materials Science

Background:

  • Acidic rainfall poses environmental risks, necessitating accurate monitoring.
  • Standardized reference materials are crucial for validating analytical methods in environmental analysis.

Purpose of the Study:

  • To develop and characterize a Standard Reference Material (SRM) for simulated rainwater.
  • To provide certified values for key chemical components in simulated rainwater samples.

Main Methods:

  • Formulation and preparation of two levels of simulated rainwater solutions (SRM 2694-I and 2694-II).
  • Analysis of 12 components using 10 different analytical techniques.
  • Statistical evaluation of analytical data to establish recommended values.

Main Results:

  • SRM 2694,
  • Simulated Rainwater,
  • was successfully developed.
  • Recommended values for pH, specific conductance, acidity, and 10 ionic components were determined.
  • Instability of ammonium ion in acidic solutions was noted and discussed.

Conclusions:

  • SRM 2694 provides a reliable standard for the analysis of acidic rainfall.
  • The material supports accurate measurement of critical rainwater constituents.
  • Specific recommendations are provided for the use of SRM 2694, especially for pH measurements.