Composition of weighing forms, and

Table 11.26 Heating Temperatures, Composition of Weighing Forms, and Gravimetric Factors...

It must be pointed out that the atomic absorption system as used today, cannot accurately determine the calcium level of a solution. The reason for this is that results will vary depending upon the other elements present and the composition of the solution. Since it is impossible to duplicate every feature of the particular serum being analyzed, results have to be compared to standards which have been made up in serum dialysates. Such standards are available in the form of the Versatols where the calcium has been dialyzed out and then weighed back. This is distinct from substances such as Validate, which are used as controls and which values are re-sults of analysis. The variability of serum composition has significantly widened what is now considered the "normal range" for serum Ca assay when done by atomic absorption (37a). 

The Composition B-4 was provided to LANL in the form of large flakes and was used as received. The tetrytol was in large to medium-size chunks. The Ml propellant and the M28 propellant were provided and used as small grains. The M8 propellant was provided in stacks of three sheets weighing 30-35 g each and sewn together with cotton thread. The sheets were not separated before being manually fed into the reactor. 

Elemental composition Ti 25.25%, Cl 74.75%. The compound is digested in acid, diluted and analyzed for titanium (See Titanium). A small amount of compound is weighed accurately and decomposed in hot water to form Ti02 and HCl ... 

When the reaction has terminated, filter off the precipitate and evaporate the solution in a bowl on a water bath until a film forms. What is the composition of the precipitated crystals Cool the solution to 0 °C, filter oH the crystals on a Buchner funnel, and dry them in a drying cabinet. Transfer the dry crystals into a previously weighed weighing bottle, weigh it, and calculate the yield in per cent. Write the equations of all the reactions. 

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