As a consequence, (1) a high yield of potassium nitrate crystals can be obtained by cooling a saturated feed solution, but (2) cooling a saturated sodium chloride solution accomplishes little crystallization, and vaporization of water is required to increase the yield. Sign in to download full...
for example, parabens, chlorobutanol, phenol, sorbic acid, thimersal, and the like. In many cases, it will be preferable to include isotonic agents, for example, sugars or sodium chloride. Prolonged absorption of the injectable compositions of agent delaying absorption, for example, aluminum monost...
b) melting point. An oil spill spreads out on the surface of water, rather than dissolving in the water. Explain why. Give two different ways of making liquid sodium change into sodium vapor. Why does water evaporate at all? Define what is an 'interstital impurity' and illu...
The combined organic phases are dried with sodium sulphate and evaporated. The title compound is identified from the residue on the basis of its Rf. c) (Z)-3-Oxabicyclo[3.1.0]hex-1-ylmethyl methanesulphonate 50 mmol of triethylamine and 20 mmol of methanesulphonyl chloride are successively ...
isonerization conditions with a catalyst consisting essentially of an effective amount of anhydrous aluminum chloride and an adsorptive alumina, said adsorptive alumina having been prepared by partially dehydrating a crystalline alumina alpha ;rihydrate formed by precipitation from a solution of sodium ...
(p - carboxyphenoxy) - cyclohexane, 2,21 - bis - (p - carboxyphenoxy)-diethyl ether and hydroquinone diacetic acid, the products being heated to melting point, or with m-cresol under nitrogen to form high polymers capable of forming fibres.ALSO:Acrylonitrile and quinitol in a molar ratio ...
Solution growth is advantageous because, due to the low temperatures involved, costly and complex growth apparatuses are usually avoided. Further, it permits the growth of crystals of NLO OM which decompose at (or below) the melting point; in fact, decomposition makes melt and vapor growth unprac...
During the heating methylene chloride was added drop-wise to facilitate the distillation of water from the mixture. The reacted mixture was washed with dilute aqueous sodium bicarbonate 25 solution and water. Methylene chloride was removed by distillation and the ester product fractionally distilled und...