Question

the following data was collected for this experiment: a sample of 0.8281 g of phenylsuccinic acid was dissolved in 10 ml of acetone. this sample gave a reading, aobs, of 10.278 deg on the polarimeter. a tube measuring 1 dm was used for the sample.

Answer 1

The question involves calculating the specific rotation of phenylsuccinic acid using polarimetry data which includes the mass of the substance, the volume of the solvent, and the observed rotation. The specific rotation is determined using the formula [α] = (αₒbs / (l * c)), taking into account the tube length and the concentration of the solution.

Step-by-step explanation:

The student has performed an experiment involving the measurement of an optical property of a substance using a polarimeter.

The substance in question is phenylsuccinic acid, which was dissolved in acetone to form a solution.

The specific optical rotation was determined using the observed angular rotation (aobs) obtained from a polarimeter after dissolving 0.8281 g of phenylsuccinic acid in 10 ml of acetone using a 1 dm tube.

To calculate the specific rotation, we use the formula [α] = (αₒbs / (l * c)), where [α] is the specific optical rotation, αₒbs is the observed rotation, l is the length of the tube in decimeters, and c is the concentration of the solution in grams per milliliter (g/ml).

The concentration is calculated by dividing the mass of the phenylsuccinic acid by the volume of the solvent (acetone).

For the given data, the calculation would proceed as follows:

1. Calculate the concentration (c) of the substance: concentration = 0.8281 g / 10 ml = 0.08281 g/ml.

2. Use the tube length (l) directly since it is already given in decimeters: l = 1 dm.

3. Calculate the specific rotation ([α]):

[α] = (10.278 deg / (1 dm * 0.08281 g/ml))

Answer 2

The student's question is focused on the calculation of specific rotation in organic chemistry, using the observed rotation provided, the path length of the polarimeter tube, and the concentration of the solution.

Step-by-step explanation:

The student's question involves the concept of specific rotation and its calculation for a chiral molecule, which is a concept in organic chemistry. The specific rotation is a measure of how much a chiral substance can rotate plane-polarized light. It is a physical property of chiral compounds and can be used to determine the concentration and purity of chiral mixtures, among other applications. To calculate the specific rotation of phenyl succinic acid from the given data, we use the formula [α] = αobs / (l × c), where [α] is the specific rotation, αobs is the observed rotation in degrees (10.278 deg), l is the path length of the polarimeter tube in decimeters (1 dm), and c is the concentration of the solution in grams per millilitre (0.8281 g/10 mL).