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Related Concept Videos

Precipitation and Co-precipitation01:17

Precipitation and Co-precipitation

5.8K
Precipitation and coprecipitation methods can be used to separate a mixture of ions in a solution. In qualitative inorganic analysis, ions that form sparingly soluble precipitates with the same reagent are separated based on the differences in solubility products. For example, consider the separation of Cu(II) and Fe(II) ions by precipitation as insoluble sulfides. First, copper(II) sulfide is precipitated by the addition of acidic H2S, where the dissociation of H2S is suppressed. Adding H2S...
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Precipitation Processes01:12

Precipitation Processes

6.6K
The experimental conditions in a gravimetric analysis should be optimized to maximize the particle size and purity of the obtained precipitate. Ideally, the concentration of the precipitating reagent should be low with effective stirring to maintain low relative supersaturation for the growth of large crystals. In homogeneous precipitation, the precipitant is slowly generated by a chemical reaction in the solution to avoid local reagent excesses. For example, urea decomposes gradually to...
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Precipitation of Ions03:11

Precipitation of Ions

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Predicting Precipitation
The equation that describes the equilibrium between solid calcium carbonate and its solvated ions is:
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Precipitation Gravimetry01:03

Precipitation Gravimetry

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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.
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...
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Indicators02:39

Indicators

64.6K
Certain organic substances change color in dilute solution when the hydronium ion concentration reaches a particular value. For example, phenolphthalein is a colorless substance in any aqueous solution with a hydronium ion concentration greater than 5.0 × 10−9 M (pH < 8.3). In more basic solutions where the hydronium ion concentration is less than 5.0 × 10−9 M (pH > 8.3), it is red or pink. Substances such as phenolphthalein, which can be used to determine the pH...
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Precipitation Titration: Endpoint Detection Methods01:19

Precipitation Titration: Endpoint Detection Methods

6.7K
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...
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Investigating the Relationship between Sea Surface Chlorophyll and Major Features of the South China Sea with Satellite Information
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Indo-China monsoon indices.

ChinLeong Tsai1, Swadhin K Behera2, Takuji Waseda2

  • 1Graduate School of Frontier Sciences, The University of Tokyo, Japan.

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|January 30, 2015
PubMed
Summary
This summary is machine-generated.

New Indochina Monsoon Indices better predict rainfall variations in Myanmar and Thailand than existing measures. These indices account for seasonal differences, crucial for understanding climate impacts on the region.

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Area of Science:

  • Climatology
  • Meteorology
  • Regional Climate Studies

Background:

  • Myanmar and Thailand face significant socio-economic damage from severe droughts and floods.
  • Interannual precipitation variation in Southeast Asia is primarily driven by the Southeastern Asian Summer Monsoon, more so than the El Niño/Southern Oscillation (ENSO).

Purpose of the Study:

  • To develop and validate new monsoon indices for Southern Myanmar and Thailand.
  • To improve the understanding and prediction of regional precipitation variations and their drivers.

Main Methods:

  • Formulation of four new monsoon indices based on regional wind anomalies.
  • Development of season-specific indices for Southern Myanmar and Thailand.
  • Comparison of new indices' correlation with precipitation variations against existing Indian Monsoon Index (IMI) and Western North Pacific Monsoon Index (WNPMI).

Main Results:

  • The Southeastern Asian Summer Monsoon is the dominant factor in regional precipitation variation, with ENSO influence limited to boreal spring.
  • Existing IMI and WNPMI show poor correlation with precipitation in Southern Myanmar and Thailand.
  • The newly developed Indochina Monsoon Indices demonstrate a significantly better correlation with regional precipitation variations.

Conclusions:

  • The Indochina Monsoon Indices provide a more accurate representation of regional precipitation drivers.
  • Season-specific indices are necessary due to differing precipitation influences throughout the year.
  • These new indices can aid in better climate impact assessments and disaster preparedness for Myanmar and Thailand.