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Extra info for Guide To Preparation of Stock Standard Solutions
Sample text
3 Element Standard Solutions: Element stock standard solutions used in the analysis of elements by analytical instruments like Inductively Coupled Plasma (ICP), Flame Photometer (FP) and Atomic Absorption (AA) which are the most commonly used in analysis of elements. Following are some examples for preparations of elements stock standard solutions. 5% w/w? 0153 g of Iron (III) chloride powder and dissolve it in small amount of water then complete to volume 1 L. 68 g of mercury sulfate (HgSO4) in one container then dissolve and complete to volume with solvent 2% nitrice acid.
Because a volumetric flask contains a solution, it is useful in preparing solutions with exact concentrations. The reagent is transferred to the volumetric flask, and enough solvent is added to dissolve the reagent. After the reagent is dissolved, additional solvent is added in several portions, mixing the solution after each addition. The final adjustment of volume to the flask’s calibration mark is made using a dropping pipette. To complete the mixing process, the volumetric flask should be inverted at least ten times.
The sample is placed in a covered weighing bottle and their combined mass is determined. A portion of the sample is removed, and the weighing bottle and remaining sample are reweighed. The difference between the two masses gives the mass of the transferred sample. com Page 52 of 61 Guide to Preparation of Stock Standard Solutions, First Edition Figure 3-2: Schematic diagram of single-arm mechanical balance. Several important precautions help to minimize errors in measuring an object’s mass. Balances should be placed on heavy surfaces to minimize the effect of vibrations in the surrounding environment and should be maintained in a level position.