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Percent purity

The purity of a synthetic preparation of methylethyl ketone (C4H8O) can be determined by reacting the ketone with hydroxylamine hydrochloride, liberating HCl (see Table 9.10). In a typical analysis, a 3.00-mL sample was diluted to 50.00 ml and treated with an excess of hydroxylamine hydrochloride. The liberated HCl was titrated with 0.9989 M NaOH, requiring 32.68 ml to reach the end point. Report the percent purity of the sample, given that the density of methylethyl ketone is 0.805 g/mL. [Pg.363]

Lead and Alloys Chemical leads of 99.9+ percent purity are used primarily in the chemical industiy in environments that form thin, insoluble, and self-repairable protective films, for example, salts such as sulfates, carbonates, or phosphates. More soluble films such as nitrates, acetates, or chlorides offer little protection. [Pg.2451]

High purity cyclohexane is manufactured by hydrogenating benzene at 400-500°F and 500 psig. Some cyclohexane was earlier produced by fractionating naphtha but its purity of 85-90% was too low to compete with 99-t- percent purity from benzene hydrogenation. A number of cyclohexane processes based on benzene hydrogenation are available. [Pg.114]

Under some conditions, it is difficult to incorporate an internal standard into a method. If the chromatogram is very complex, an internal standard may interfere with quantitation of a peak of interest. The development of highly precise sample transfer techniques, including modem autoinjectors, reduces the dependence of the experimentalist on the use of an internal standard to correct for effects of dilution and transfer losses. In many cases, external standardization can be used effectively. The weight percent purity is determined by comparing the area of each peak in a chromatogram with those generated by separately injected pure standards of known concentration. [Pg.186]

Chloro-2-(chloromethyl)propene was prepared according to the method of Lynch and Dailey.4 Percent purity was determined by GLC, and 0.400 mol of starting material was calculated accordingly. A typical experiment used ca. 54 g of alkene that was 92-93% pure by GLC... [Pg.198]

Figure 2.9 Response surface showing an inherently continuous response (percent purity of a protein) as a function of an inherently discrete factor (number of recrystallizations). Figure 2.9 Response surface showing an inherently continuous response (percent purity of a protein) as a function of an inherently discrete factor (number of recrystallizations).
Fig. 6.7 Visualization of HTS data using Spotfire decision site [48]. Shown are a table of data (top left), a bar chart (top right, number of compounds screened from each plate), 3-D scatterplot (bottom left, percent inhibition in the primary assay versus percent inhibition in the confirmation assay versus percent purity), and a plate map (bottom right, well versus Column arranged by plate number). In the 3-D scatterplot and the plate map, the points are colored by plate number and sized by percent inhibition in the primary assay. Fig. 6.7 Visualization of HTS data using Spotfire decision site [48]. Shown are a table of data (top left), a bar chart (top right, number of compounds screened from each plate), 3-D scatterplot (bottom left, percent inhibition in the primary assay versus percent inhibition in the confirmation assay versus percent purity), and a plate map (bottom right, well versus Column arranged by plate number). In the 3-D scatterplot and the plate map, the points are colored by plate number and sized by percent inhibition in the primary assay.
Standard Explosive Sampling, Inspection and Testing , MIL-STD-650(3 Aug, 1962), Method 410.1 (Detn ofMF content in primers or the percent purity) 18) StdMethodsChemAnalysis,... [Pg.612]

It takes 45 00 ml of a given HC1 solution to react with 0 2435 g calcite CaC03 This acid is used to determine the percent purity of a Ba(OH)2 sample as follows... [Pg.201]

Figure 8.4 Percent purity using open microwave plate. Figure 8.4 Percent purity using open microwave plate.
Researchers are also exploring ways of using inorganic materials, especially those closely related to natural hone material, for artificial bone filling. Interpore International of Irvine, California, for example, received approval in 1992 for its hydroxyapatite-based hone substitute called Pro Osteon. The material is made from coral that has been heated to temperatures of about 2000°C to obtain hydroxyapatite (a primary component of coral) of 95 percent purity. The material is then formed into a scaffolding resembling natural bone, and this final product is irradiated with gamma rays to sterilize it. [Pg.60]

Toluene (Tc = 591.7 K, Pc = 4.115 MPa) and cyclohexane (Tc = 553.4 K, Pc = 4.074 MPa) were used as the supercritical fluids in the work reported here. They were obtained in drum quantities at greater than 99 percent purity and used as received. Owing to inefficiency in the separator, some of the destracted residuum is collected with the solvent. This material is recovered in a rotary evaporator. The distilled solvent is then reused in the FDU. In the figures in this report that depict residuum overhead data, correction has been made for the residuum recovered in the spent solvent. [Pg.232]

Acetylene (C2H2) is a colorless and flammable gas. At 100 percent purity, acetylene is odorless, but at commercial purity it has a garliclike odor. Acetylene can be liquefied and solidified with ease, although in both cases it explodes with extreme violence when ignited. [Pg.1230]

A typical high-efficiency fractionation system (Fig. 36.14) consists of one continuous straight distillation and one, or preferably two fractionation columns.I0,17a,b This system is very efficient for the separation of low-boiling fatty acid components,6,10 a C12 fraction of 99.5 percent purity from coconut fatty acid or a C22 fraction of 95 percent purity from rapeseed fatty acid is readily obtained. [Pg.1712]

A synthesis gas process is described in Probs. 13 through 18 of Chap. 2. Prepare a plant layout for a production of 25 MM scf/day which can use either air or 95 percent purity oxygen as the oxidant in this process. [Pg.109]


See other pages where Percent purity is mentioned: [Pg.1269]    [Pg.1543]    [Pg.2053]    [Pg.212]    [Pg.157]    [Pg.224]    [Pg.480]    [Pg.52]    [Pg.52]    [Pg.130]    [Pg.154]    [Pg.32]    [Pg.174]    [Pg.28]    [Pg.158]    [Pg.64]    [Pg.97]    [Pg.241]    [Pg.245]    [Pg.526]    [Pg.526]    [Pg.528]    [Pg.1011]    [Pg.1229]    [Pg.1404]    [Pg.138]    [Pg.374]    [Pg.123]    [Pg.45]    [Pg.34]    [Pg.480]   
See also in sourсe #XX -- [ Pg.209 ]




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