And equivalent weight

See Section 2B.2 for a review of chemical equivalents and equivalent weights. 

Formulas, Molecular and Equivalent Weights, and Conversion Factors to CaCO, of Substances Frequently Appearing in the Chemistry of Water Softening... 

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. 

The E. I. DuPont Co. presented empirical equations for the tensile strength, elongation at yield, and tensile modulus as a function of cation type, water content, and equivalent weight in the range 1000 < EW < 1400 and at temperatures in the range 0 < T < 85 These equations were shown in early... 

With an omme After determining the epoxy value and equivalent weight of the resin prepared according to b), a small sample is melted in the oven at 150 °C with the equivalent amount (0.25 mol per mol epoxy groups) of finely powdered 4,4 -methylenedi-aniline and the mixture well stirred for 30 s. After heating for 1 h at 150 °C, the sample is taken out it has now become insoluble and infusible. 

Pommer A. M. and Breger I. A. (1960) Potentiometric titration and equivalent weight of humic acid. Geochim. Cosmochim. Acta 20, 30-44. 

Figure 5. Structure, molecular and equivalent weights, and pKa (at 25° C ) of organic acids.

Polyether Polyols. The major polyols for preparing various urethane foams are polyether polyols. Polyester polyols are used only in specific applications. The advantages of polyether polyols are choice of functionality and equivalent weight the viscosities are lower than those of conventional polyesters production costs are cheaper than for aliphatic polyesters and resulting foams are hydrolysis-resistant. 

Throughout this text, we base volumetric calculations exclusively on molarity and molar masses. We have also included in Appendix 6 a discussion of how volumetric calculations are performed ba.sed on normality and equivalent weights because you may encounter these terms and their uses in the industrial and health science literature. 

Volumetric Calculations Using Normality and Equivalent Weight... 

Appendix 4 Formation Constants at 25°C A-10 Appendix 5 Standard and Formal Electrode Potentials A-12 Appendix 6 Use of Exponential Numbers and Logarithms A-15 Appendix 7 Volumetric Calculations Using Normality and Equivalent Weight A-19... 

Let V and E be respectively the valency and equivalent weight of an element and A be the atomic weight. 

We shall use molarity throughout the majority of the text for volumetric calculations. However, another useful concentration unit for volumetric calculations is normality, which uses the concepts of equivalents and equivalent weights in place of moles and formula weights. Normal concentration depends on the particular reaction, and the reaction should be specified. Some instructors prefer to introduce the concept of normality, and students are likely to encounter it in reference bop. Therefore, a review of equivalents and normality is given following the discussion of calculations using molarity. 

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