Calculations equivalent weight

Eor phosphoric acid, the number of equivalents is the number of Fi ions donated to the base. Eor the reactions in (a), (b), and (c) the number of equivalents are 3, 2, and 1, respectively. Thus, the calculated equivalent weights and normalities are... 

Since the actual number of protons transferred between the analyte and titrant is uncertain, we define the analyte s equivalent weight (EW) as the apparent formula weight when = 1. The true formula weight, therefore, is an integer multiple of the calculated equivalent weight. 

The calculated equivalent weight of aminomethanesul-fonic acid is 111.1. For the recrystallized material, values of 99.9% to 100.2% purity were consistently obtained. 

Perfluoroalkylene telomer diiodide intermediates were purchased from the Thiokol Corp. Perfluoroalkylene ether dicarboxylic acid intermediates were purchased as a mixture of the acid fluorides from PCR, Inc. under an agreement with Dupont. Properties of distilled fractions are indicated in Table II. The discrepancy in observed and calculated equivalent weights results from the presence of close boiling mono acid fluoride by-products, C3F70(CFCF20)nCFCF3C0F. 

In Ref. 130 it was shown that the calculated equivalent weight, Geq [see Eq. (61)] depends slightly on the concentration of H2SO4 it was observed that Geq = 7.5 in 0.1 M solution and increases to 10 in 1 M solution. There could be many reasons for this dependence. The main one is probably the influence of the concentration of at the electrode surface and in the diffuse double layer on the structure of solvent near the surface. However, this fact does not point unambiguously to co-adsorption... 

Does your structure agree with the calculated equivalent weight ... 

Determination of epoxide content as described above gives values corresponding to the calculated equivalent weight of 225. 

An analysis of the ability of plant structures to resist the effects of explosions can usually be limited to an examination of their capacity to resist the free field or reflected and focused overpressure. In estimating the peak overpressure on a structure, the pressure-distance relationships developed for TNT can be utilized for the detonation of solid substances. For solid substances whose energy density differs from that of TNT, factors to be used in calculating equivalent weights of TNT should be recovered from the literature. For substances known to have explosive potential but whose explosive properties have not been investigated and tabulated, it is reasonable, as a first estimate, to assume that their explosive properties are equivalent to those of TNT. 

Example 14.12 Solution Stoichiometry Calculating Equivalent Weight ... 

Repeat the titrations until consistent values (i.e., values which do not differ by more than 0 1 ml. of glucose solution) are obtained. Then calculate the weight of glucose equivalent to 1 ml. of the Fehling s solution. 

The saponiflcatlon equivalent or the equivalent weight of an ester is that weight in grams of the ester from which one equivalent weight of acid is obtainable by hydrolysis, or that quantity which reacts with one equivalent of alkali. The saponification equivalent is determined in practice by treating a known weight of the ester with a known quantity of caustic alkali used in excess. The residual alkali is then readily determined by titration of the reaction mixture with a standard acid. The amount of alkafi that has reacted with the ester is thus obtained the equivalent can then be readily calculated. 

Calculate the equivalent weight and normality for a solution of 6.0 M 1T3P04 given the following reactions ... 

If the number of equivalents per mole is known, the molecular weight is calculated from the equivalent weight by multiplying the latter by the number of equivalents per mole. 

Hydroxyl Number. The molecular weight of polyether polyols for urethanes is usually expressed as its hydroxyl number or percent hydroxyl. When KOH (56,100 meg/mol) is the base, the hydroxyl number is defined as 56,100/equivalent weight (eq wt). Writing the equation as eq wt = 56,100/OH No. allows one to calculate the equivalents of polyol used in a urethane formulation, and then the amount of isocyanate required. The molecular weight can be calculated from these equations if the fiinctionahty, is known mol wt = / eq wt. 

Apparent equivalent weight can be deterrnined by titration with hydrochloric acid using a bromocresol green indicator. Calculations give the equivalent weight of total amines and are not specific for the mono-, di- or tri alkan olamines. 

Cathode Efficiency. Faraday s law relates the passage of current to the amount of a particular metal being deposited ie, 96,485 coulombs, equal to one Faraday, deposits one gram-equivalent weight of a metal at 100% efficiency. The cathode efficiency, an important factor in commercial electroplating, is the ratio of the actual amount of metal deposited to that theoretically calculated multipHed by 100%. 

Determine the end point from the plot of current against volume of iron reagent. Calculate the weight of nitrate ion equivalent to 1.0 mL of the 0.4 M iron solution. 

Evidently, the titratable functions of M are two very strong bases, since the equivalent weight of M calculated from the curve was 391, corresponding to approximately half the molecular weight (791) calculated from the analyses discussed above. Apparently, one of the functions was due to the guanidino group of the isolated... 

The value obtained for active matter by this method can be used to calculate average equivalent weight of the sample. 

Alkalinity measurement is also required for the determination of active matter by difference and equivalent weight calculations. It can be determined as two of the following compounds sodium bicarbonate, sodium carbonate, or sodium hydroxide. The sample is titrated to a phenolphthalein endpoint to determine the sodium hydroxide/sodium carbonate content. An added measure of acid converts any bicarbonate to carbon dioxide, which is subsequently removed from the solution. Back-titration of the excess acid gives a measure of the amount of bicarbonate and/or carbonate present. 

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