aqueous15% sodium hydroxide (47 mL, over 20 min), and water (141 mL, over 30 min). The solutionis stirred for 30 min and the white precipitate is filtered. The filter cake is washed with ethylether (3 × 150 mL) and the organic filtrates are combined, dried with anhydrous sodiumsulf...
Cosmetic and pharmaceutical compositions in the form of solid aqueous gels having a modulus of linear constraint of 5,000 - 50,000 Pascals, comprise polyvinyl alcohol having units of formula (I) and optionally of formula (II). Those of formula (II) being 5 % at most, together with at ...
polymerization of a mixture of ethylenically unsaturated monomers that contains at least one ethylenically unsaturated alkoxysilane monomer in an aqueous medium in the presence of a dispersed fine particulate inorganic solid and at least one dispersing agent are useful for the priming of mineral ...
What volume of 0.104 N H2SO4 is required to neutralize 15.2 mL of 0.152 N NaOH? An aqueous solution of 6.3 g oxalic acid is made up to 250 mL. Calculate the volume of 0.1 N sodium hydroxide needed to neutralise...
求一道英文化学题的翻译The action of concentrated H2SO4 on urea, (H2N)2CO, results in the production of a white crystalline solid X of formula H3NO3S. This is a monobasic acid. On treatment with sodium nitrite and dilute hydrochloric acid at 273K, one mol
growth rate frombplotted against the temperature of the maximum Hsp70 response inc. Error bars represent the standard deviation of temperature for the fit of the skew-normal distribution (y-axis) or cardinal temperature model with inflection (x-axis). Solid line shows a linear fit, dashed line ...
Titanium cannot be electroplated onto other metals with current science and aqueous solutions. However, plating onto titanium can be accomplished by alloying with nickel to increase a substrate’s resistance to corrosion, or with platinum to improve its appearance. Electroplating on Plastic Electroplating...
The regioselectivity of the addition of hydroxylamine to acetylenic ketones can be controlled by the choice of solvent: in a mixture of tetrahydrofuran-water, the reaction proceeds in a 1,4-manner [26], while in aqueous methanol, 1,2-addition products are formed [27,28]. Ynones in 6 could...
The crushed seeds were then mixed with water to make an aqueous extract of the seeds. All of the extracts were filtered by cheese clothes and then kept in an incubator at a 45 °C temperature. The crude materials of the different semisolid extracts of the tamarind parts are henceforth ...
Answer to: 100 mL of a 0.1 M solution of NaOH is neutralized to pH 7 with H2SO4. How many grams of H2SO4 are required to achieve this...