Laboratory Procedures

Ferrocyanide Methods of Analysis & Assay Procedure

QUALITATIVE DETECTION

Because of the distinctive colors of the precipitates formed, various cations have been proposed for the qualitative detection of the ferrocyanide ion. Since interference frequently occurs, some care is usually necessary. As an illustration, the following condensed procedure serves for the detection of the ferrocyanide ion in the presence of ferricyanide

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By | 2017-06-20T09:40:14+00:00 June 20th, 2017|Categories: Laboratory Procedures, Reagents and Chemicals|Comments Off on Ferrocyanide Methods of Analysis & Assay Procedure

Gravimetric Analysis Precipitation Reactions Examples

The conditions essential to accurate gravimetric analysis have been given. As a rule such estimations come under one of four classes:

Direct Estimations

These are the most usual and accurate methods of gravimetric analysis. The element sought is precipitated and weighed generally as a compound, definite in composition.

Direct Estimation by Loss

Here the element sought is volatile or forms a volatile

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By | 2017-03-19T08:44:35+00:00 January 20th, 2017|Categories: Laboratory Procedures|Comments Off on Gravimetric Analysis Precipitation Reactions Examples

Quantitative Chemistry Gravimetric Analysis: PRECIPITATE

WASHING THE PRECIPITATE: A precipitate may be washed directly on the filter, or it may be washed partly by decantation and partly on the filter. If by decantation, the precipitate is allowed to settle, and the supernatant liquid is poured on the filter. Wash water is added to the precipitate, and after

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By | 2017-03-17T19:06:33+00:00 January 20th, 2017|Categories: Laboratory Procedures|Tags: , |Comments Off on Quantitative Chemistry Gravimetric Analysis: PRECIPITATE

Gravimetric Analysis: Substance into Solution

Material of Vessels for Solution

The student must consider the effect of the solvent used on the vessel. In most cases the solvent used is an acid or mixture of acids, and for such solvents glass and porcelain are generally used. Platinum may be used, provided no chlorine or other attacking agent be present. (See notes regarding care and use of platinum

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Gravimetric Analysis: Precipitation

After solution, certain minor operations may or may not be necessary, but as a rule the next essential operation is that of precipitation. In his qualitative work the student has already come across many cases of precipitation, and he will find that many of the methods there used are again applied for quantitative purposes.

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Gravimetric Analysis: Precipitate Filtration

When precipitation is complete the precipitate must be separated from the solution. The means of bringing about this separation will be described under this head. Under the next head (Washing) the completeness of this separation will be considered.

Filtering Medium

In quantitative gravimetric analysis the two materials generally used are paper and asbestos, and the

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By | 2017-03-17T19:06:36+00:00 January 19th, 2017|Categories: Laboratory Procedures|Tags: |Comments Off on Gravimetric Analysis: Precipitate Filtration

Quantitative Analysis Chemistry: GRAVIMETRIC METHODS

In the course of work completed, the problem so far met with has been the determination of the various elements (or compounds) present in a substance. In an ore, for instance, there may be present silica, iron, copper, arsenic, and sulphur, and it is the province of qualitative analysis to determine the presence or absence of these and other elements.

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By | 2017-03-17T19:06:37+00:00 January 18th, 2017|Categories: Laboratory Procedures|Tags: |Comments Off on Quantitative Analysis Chemistry: GRAVIMETRIC METHODS

Analytical Balance

Analytical Balance Principle

In this place it will be sufficient to describe the usual chemical balance, designed to carry in each pan a load up to 100 gms. This balance can be obtained at a reasonable figure, and sensitive to 1/10 of a milligram (0.0001 gm.). In the section on Assaying the student will find two other forms—Pulp Scales and the Assay Balance— mentioned. The

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By | 2017-03-18T06:25:11+00:00 January 18th, 2017|Categories: Equipment, Laboratory Procedures|Tags: |Comments Off on Analytical Balance

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