Phthalate, Potassium

Diphenylsilane reacts with two equivalents of neat n-heptanal in the presence of anhydrous cesium fluoride within three minutes at room temperature to form di-n-hep toxy diphenylsilane quantitatively (Eq. 162).319 Potassium fluoride and potassium phthalate are considerably less effective promoters, even at temperatures up to 140°.319... 

Mueller and Bandaranayake [39] were able to show that more than 95% of the following compounds were oxidised in the first run, when present in the water sample at the 5 mg C per litre level oxalic acid, potassium phthalate, humic acid, glucose, sucrose, ascorbic acid, glycine, and phenol. Only sulfur compounds gave incomplete recoveries [58,88]. 

All values determined in pH 4.7, 0.002AT potassium phthalate buffer at 20°. The gas-chromatographic values are averages with the number of determinations indicated by the number in parentheses. 

Fig. 11. Absorption spectrum of the 3 1 ferropyrimine complex at pH 4.0 in potassium phthalate buffer. 0.05m See Reference (119).

The pH of a 0.05 molar solution of acid potassium phthalate is 4.00 the first stage dissociation constant of phthalic acid is 1.3 X 10 what is pk2 for this acid ... 

Anionic activation of Si—H bonds " by fluorides, such as KF or CsF, or by potassium phthalate, KHCO3, KSCN, etc., yields powerful hydridic reagents that reduce the carbonyl group of aldehydes, ketones and esters, " and 1,2-reductions of a,p-unsaturated aldehydes and ketones occur with high selectivity. " The analogous activation of hydridosllanes by fluoride ions is also achieved under acidic conditions with boron trifluoride etherate, in which the latter compound is consumed and fluorosilanes are formed. ... 

FIGURE 5.47. Current changes under illumination and dark conditions for an n-Si electrode at 1.0 in 0.1M potassium phthalate solution containing various concentrations of NH4F. (Reprinted from Matsumura and Morrison. 1990, with permission from Elsevier Science.)... 

Calculate the hydronium ion concentration of a buffer that is 0.0500 M in potassium hydrogen phthalate (KHP) and 0.150 M in potassium phthalate (K2P). 

S. B. Smith, who has made a thorough examination of the phthalic acid-potassium biphthalate system, found that the recrystallization must not be carried out below 35°. When the preparation is pure or contaminated only with potassium phthalate, the crystallization may take place at 25°. If it is too acid, however, the impurity can be eliminated only by recrystallizing above 35°, for otherwise a small portion of the salt 1 potassium phthalate-4 phthalic acid-4H20 separates out. In any event it is advisable to test the composition of the final recrystallized product by titrating with alkali in the presence of phenolphthalein as indicator. The molecular weight of potassium biphthalate is 204.2. 

Figure 6.9. Separation of standard solutions of sulfate (2.75-13.75 ppm) from chloride and nitrate. Resin XAD-1, 44-57 pm 0.04 mequiv/g eluent, 5,0 X 10 M potassium phthalate, pH 6.2.

Several anions have proven to be effective for indirect photometric detection, figure 6.16 shows an excellent separation of conunon anions with 2.0 mM potassium phthalate, pH 6.0, with indirect detection at 280 nm. By switching to 4.0 mM p-hydro-xybenzoic acid, pH 8.5 with 2.5 % methanol, detection at 310 nm, and reducing the column length to 10 cm, the same anions plus phosphate could be separated in only... 

Merrifield resin purchased from Pierce Chemical Co. which contains 0.9 meq/g of chloromethyl groups was treated with histamine free base in the presence of triethylamine.(V) The ring substitution ratio was 2.8% by histamine, 4.5% by chloromethyl group. Some Merrifield resin and potassium phthalate in dry DMF was heated at 120 C overnight. When the reaction was completed, the resin was filtered, washed and treated with NH2NH2 H20 followed by 5% NaOH to give an orange-colored resin. No chlorine was detected in the resin. 

The chemiluminescence reactions of the phthalhydrazides (la-g) were carried out in the aerobic DMSO solution in the presence of BuOK. The chemiluminescence intensities relative to the luminol chemiluminescence are also described in Table 1. As expected from their strong fluorescence, If and Ig produced much stronger chemiluminescence than the others. Since their chemiluminescence spectra agreed well with the fluorescence spectra of the corresponding potassium phthalates, the emitters are the phthalate ions (2f and 2g) similar to the luminol chemiluminescence. 

What is the pH of a solution that is 0.25 M each in potassium acid phthalate (KHP) and potassium phthalate (K2P) ... 

Potassium Biphthalatc. Phthaiic acid potassium acid salt potassium acid phthalate potassium hydrogen phthalate acid potassium phthalate. CgHsKO( mol wt 204.22. C47.0S%, H 2.47%, K 19.14%, O 31.34%. HOOC-C(H4COOK, Prepd by half-neutralization of a phthaiic anhydride soln F. J. Welcher, Organic Analytical Reagents vol. 2 (Van Nostrand, New York, 1947) pp 75-79. 

Benzoic acid — Thio-benzoic acid — Sulpho-benzoic acid — Phthalic acid—Ethyl-potassium phthalate—Phenyl-acetic acid—Cinnamic acid—Benzyl-malonic acid.56-58... 

Potassium biphthalate CAS 877-24-7 EINECS/ELINCS 212-889-4 Synonyms 1,2-Benzenedicarboxylic acid, monopotassium salt Hydrogen potassium phthalate Monopotassium 1,2-benzenedicarboxylate Phthalic acid, monopotassium salt Potassium acid phthalate Potassium hydrogen phthalate Classification Salt Empirical CsH604 K... 

WaterslM 430 Conductivity Detector 1 mmol, potassium phthalate 5 lS/s 1.2 ml/min. 

Fig. 71. Anion separation using potassium phthalate eluent...

The determination of esters derived from phthalic acid is also of great interest for the toxicity evaluation of an essential oil. Considering that esters commonly contained in essential oils are derived from monobasic acids, at rst, saponi cation is carried out through the addition of an etha-nolic potassium hydroxide solution. The formed potassium phthalate, which is not soluble in ethanol, generates a crystalline precipitate [17]. 

Phthalic anhydride in alkyl resins was first saponified, precipitated as potassium phthalate, the alcoholate was dissolved in sulphuric acid and the curve was recorded in the presence of tetramethylammonium bromide. < > However, the application of the two-phase saponification, mentioned in the previous paragraph, seems to be more convenient. 

C8H4K20ft H2O, Potassium phthalate monohydrate, 46B, 83 C8H5KO4, Potassium acid phthalate, 30B, 62... 

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