Glucose solution preparation

Seif-Test 8.11A Calculate the vapor pressure of water at 90.°C for a solution prepared by dissolving 5.00 g of glucose (C6H1206) in 100. g of water. The vapor pressure of pure water at 90.°C is 524 Torr. 

VO(acac)2 < VO(Et-acac)2 VO(Me-acac)2 BMOV. Conversion rates for all hydrolysis products were faster than for the original species. Both EPR and visible spectroscopic studies of solutions prepared for administration to diabetic rats ocumented both a salt effect on the species formed and formation of a new halogen-containing complex. The authors concluded that vanadium compound efficacy with respect to long-term lowering of plasma glucose levels in diabetic rats traced the concentration of the hydrolysis product in the administration solution. 

Sample Preparation in 6M Urea. Solutions of glucose were prepared directly in 6M urea. D2O solutions were prepared by diluting equal volumes of D2O and 12M urea and the resulting solution was then diluted 1 1 with 6M urea. 

A particularly interesting and general reducing system for the preparation of azoxy compounds uses a strongly alkaline glucose solution as a reducing agent. 

Preparation of a Glucose Solution. Dissolve 0.4 g of glucose in 8 ml of water, add one drop of a concentrated nitric acid solution, and hoil the mixture during two minutes. Cool the solution and add an equal volume of ethanol (for what purpose ). 

Coating the Test Tube Walls with Silver. Mix the ammonia solution of silver with the glucose solution in the proportion 10 1. Pour 4-5 ml of the reaction mixture into the prepared test tube and lower the latter into a beaker with warm water (50-60 C). What do you observe Write the equations of the reactions. How can the walls of the tube be cleaned of the deposited silver ... 

To prepare a 0.1 M glucose solution, weigh 18.02 g of glucose and transfer to a 1-liter volumetric flask. Add about 700-800 mL of purified water and swirl to dissolve. Then add water so that the bottom of the meniscus is at the etched line on the flask. Stopper and mix well. The flask must be labeled with solution contents (0.1 M glucose), date prepared, and name of preparer. 

What is the normal boiling point (in °C) of ethyl alcohol if a solution prepared by dissolving 26.0 g of glucose (C6H1206) in 285 g of ethyl alcohol has a boiling point of 79.1 °C See Table 11.4 to find Kb for ethyl alcohol. 

Although inconvenient, it s possible to use osmotic pressure to measure temperature. What is the temperature (in kelvins) if a solution prepared by dissolving 17.5 mg of glucose (C6H1206) in 50.0 mL of aqueous solution gives rise to an osmotic pressure of 37.8 mm Hg ... 

Detection and Determination of Dextrin.—Dextrin occurs especially in products containing commercial glucose and its presence is demonstrated by the high dextro-rotation (see Crystallised Fruit, Determination of the Sugars, c). To determine it, 100 c.c. of the inverted solution, prepared as for the determination of the sugars (see 1), are treated as indicated on p. 142 (section 4) to transform the dextrin into glucose,... 

Dilute the standard glucose solution to make 0.2, 0.4, 0.6, 0.8, and 1.0 g/ell solutions. Use these known glucose solutions as samples for step 3 and 4. Prepare a calibration curve which shows the absorbance versus glucose concentration. 

For example, sodium ion is the principal cation of the extracellular fluid of the mammalian body, comprising, as the chloride and bicarbonate, more than 90% of the total solute in that fluid. Ingestion of sodium chloride solutions is used to replace salt lost by excessive perspiration. More sophisticated preparations have been proposed for this purpose one such preparation5 comprises mainly sodium chloride, supplemented with smaller amounts of potassium and phosphate ions to approximate the average composition of sweat in a sweetened glucose solution. 

Let s calculate the molality of a solution prepared by dissolving 1.0 g of glucose in 20 g of water. Again, we start by finding the moles of glucose. 

The first formulation is useful as a conversion factor between grams of solute and milliters of solution. The second is more useful to calculate the concentration of a solution. For example what is the percent (w/v) of a solution prepared by dissolving 25 g of glucose in enough water to give a total volume of 500 mL ... 

For example, what is the percent by weight concentration of glucose in a solution prepared by dissolving 25 g of glucose in 475 g of water As with all solutions problems, we need to be very careful about the definitions. The mass of solute is obviously 25 g, but what about the grams of solution The solution consists of both glucose and water, so the total solution mass is 500 g, not 475 g. So the percent concentration is ... 

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