Carboxylic acids, equivalent weights

Carbon dioxide, 184, 358, 359 solid see Dry Ice Carbon disulphide, 767 purification of, 175 Carbon monoxide, 185, 1003, 1004 Carbon, decolourising, 127, 128 Carbon tetrachloride, 733, 815 drying of, 734 purification of, 176 Carbonyl chloride, 185 Carborundum chips, 4 Carboxylic acids, equivalent weights of, 1071 ... 

Vinyl dispersion resins have typically consisted of inert homopolymer or copolymers of vinyl chloride and vinyl acetate, and although the inertness has been of importance for a multitude of applications, there are occasions when reactive functionality is an aid. An example of such a reactive vinyl resin is Geon 137, a carboxyl modified dispersion resin with a carboxyl content equivalent to 1.79% on a resin weight basis or an acid equivalent weight of about 2500. One adhesive application of considerable interest is in the production of flocked product, notably wall and floor coverings. A 50% replacement of standard copolymer dispersion resin with carboxyl functional resin doubles the force required to pluck fibers loose. Test results of laminating carboxylic vinyl plastisol with nylon fabric have shown a threefold increase in adhesion. Such plastisols also show improved adhesion to glass and polyester fabrics. ... 

Total weight of N-benzoylquinotoxine carboxylic acid ethyl ester thus obtained was 2.72 g, equivalent to 63.4% of the theoretical. 

The neutralization equivalent is a useful means of determining the molecular weight of a carboxylic acid. The process begins with a simple neutralization reaction of acid with standard base (usually sodium hydroxide). The reaction is... 

Carboxylic acids dissolve in Na,CO, thereby evolving CO,. The neutralization equivalent or equivalent weight of a carboxylic acid is determined by titration with standard base it is the number of grams of acid neutralized by one equivalent of base. If 40.00 mL of a O.IOON base is needed to... 

Because the molecular weight of the acid (118) is twice this equivalent weight, there must be two equivalents per mole. The number of equivalents gives the number of ionizable hydrogens. This carboxylic acid has two COOH groups. 

The NE of a carboxylic acid is its equivalent weight (molecular weight divided by the number of COOH groups). Since CO, is lost on heating, there arc at least 2 COOH s in acid (A), and loss of CO, can produce a... 

Chain Extension of -U-Polystyrene Hiols. A two-stage chain extension of the. -kJ -polystyrene diols was accomplished by carboxylation of the diols with succinic anhydride followed by chain extension with a diepoxide. The succinic anhydride reaction was carried out 120-130°C under nitrogen. The reaction was monitored bj changes in the carbonyl bands at 1715 and 1740 cm in the infrared spectra of the reaction mixtures. The resulting dicarboxylic acid polymers were chain-extended in bulk at 130°C for 9 hours with Sow s HER diepoxide, equivalent weight =171, using bis( 3,5-diisopropylsalicylato)Cr (III) as the catalyst. 

The equivalent weights for these resins ranged from 1000 to 2000 meq/g, in both sulfonic and carboxylic acid forms. 

Table II. Properties of Carboxylic-Acid Form of Perfluorinated Ionomer Membranes as a Function of Equivalent Weight.

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