Calculate the specific rotation of a substance that is dissolved in a solvent (0.4 g/mL) and that has an observed rotation of –10° as determined with a 0.5-dm cell.
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Calculate the specific rotation of a substance that is dissolved in a solvent (0.4 g/mL) and that has an observed rotation of –10° as determined with a 0.5-dm cell.
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- Calculate the observed rotation for a solution of a substance (2.0 g/mL) that is 80% optically pure. A 2-dm cell is used. The specific rotation for the optically pure substance is 120°.An aqueous solution containing 9.01 g of an optically-pure compound was diluted to 6.00 × 102 mL with water and placed in a 10.0 cm long polarimeter tube. The measured rotation was -4.13° at 25° C. Calculate the specific rotation of the compound. [a=If we mix 20cm^3 sucrose of 250g/dm^3 mass concetration with 20cm^3 water, what will be the light rotation of the solution at 2dm light path. The specific rotation of sucrose is 66.5(° cm^3)/(gdm)
- 3. (a) The optical rotation [a]20 of aqueous samples of pure a-D-glucose and 1 pure ß-D-glucose were measured over time and a graph plotted (below). The optical rotation of both samples tends towards the same value, +52.7, as time proceeds. Explain, with the use of a diagram, why this trend is observed. +112 [a] +52.7 +19 TimeExplain the difference between absorption and adsorption in natural dyes. Use sketches to clarify your explanation.What are the fundamental differences between a good solvent and a theta solvent, and how do they effect polymer configuration?
- A student dissolved 16.7 mg of sunscreen in 25 mL of 2-propanol. They then diluted this stock solution by a factor of 10 and measured the UV-Vis absorption of this diluted sample as 0.54. What is the absorbance/mg of the sunscreen the student used?Which is the more reliable technique for identifying an unknown compound and why? IR spectrum Melting point Thin-layer chromostography (TLC)1-Desorptin of chemically adsorbed materials on surfaces occur easily due to the presence of chemical forces. *
- A solution of 2.0 g of (+)-glyceraldehyde, HOCH2CHOHCHO, in 10.0 mL of water was placed in a 100-mm cell. Using the sodium D line, a rotation of +1.74° was found at 25 °C. Determine the specific rotation of (+)@glyceraldehyde.1) A polyester made from sebacic acid (CAS# 111-20-6) and 1,6-hexanediol (CAS# 629-11-8) has the molecular weight fractionation listed below. Calculate an appropriate average molecular weight for this polyester. Source: Batzer, H., Macromolecular Chemistry and Physics 5What is the concentration of an unknown sample if its optical rotation is +28.50 deg mL/dm g. Its actual rotation is +45.37 deg in a 25 cm polarimeter tube. Show the equation involved and enclosed your final answer. Express your final answer in 2 significant figures.