(-)-Mandelic acid has a specific rotation of -158°. What would be the specific rotation of a...

(-)-Mandelic acid has a specific rotation of -158°. What would be the specific rotation of a solution which contains 40% (-)-mandelic acid and 60% (+)-mandelic acid?

+95°

-32°

-63°

+63°

+32°

Expert Solution

Given the % of (-)-mandelic acid is 40%

its specific rotation = -158^o

Given the % of (+)-mandelic acid is 60%

its specific rotation = +158^o

The specific rotation of the solution = (% of - rotation x its percentage)+(% of + rotation x its percentage)

= [(40/100)x(-158) ] + [(60/100) x (+158)]

= +32 ^o

queen_honey_blossom answered 2 years ago

1.The specific rotation, [α]D, for (-)-malic acid is -27. What is the observed rotation for a...

1.The specific rotation, [α]D, for (-)-malic acid is -27. What is the observed rotation for a solution of 0.50 g of (-)-malic acid in 10 mL of water in a sample tube having a pathlength of 10 cm? B) The observed rotation of a solution of 1.3 g of a compound in 10 mL of water is +11 degrees. If the pathlength is 10 cm, what is the specific rotation of the compound? 2. The specific rotation, [α]D, for (-)-2-butanol...

The specific rotation of optically pure (2S,3S)-tartaric acid is -12°. The optical rotation of an impure...

The specific rotation of optically pure (2S,3S)-tartaric acid is -12°. The optical rotation of an impure sample containing a mixture of enantiomers of this compound was measured to be -9°. In the boxes below, write the percentages of the specified stereoisomers present in the sample. Show your work below. Percentage of (2S,3S)-tartaric acid? Percentage of (2R,3R)-tartaric acid? What is the specific rotation of pure (2S,3R)-tartaric acid? How do you know?

The specific rotation, [α]D, for (-)-2-butanol is +14. What is the observed rotation for a solution...

The specific rotation, [α]D, for (-)-2-butanol is +14. What is the observed rotation for a solution of 1.0 g of (-)-2-butanol in 10 mL of water in a sample tube having a pathlength of 10 cm? ??????degrees . The observed rotation of a solution of 1.5 g of a compound in 10 mL of water is +3.4 degrees. If the pathlength is 10 cm, what is the specific rotation of the compound? .

The specific rotation, [α]D, for (-)-malic acidis -27. What is the observed rotation for a solution...

The specific rotation, [α]D, for (-)-malic acidis -27. What is the observed rotation for a solution of 0.75 g of (-)-malic acid in 10 mL of water in a sample tube having a pathlength of 10 cm? The observed rotation of a solution of 1.4 g of a compound in 10 mL of water is -10degrees. If the pathlength is 10 cm, what is the specific rotation of the compound? The specific rotation, [α]D, for (-)-malic acidis -27. What is...

Pure l-phenylalanine has a specific rotation of -35.1 degrees. What is the enantiomeric excess of a...

Pure l-phenylalanine has a specific rotation of -35.1 degrees. What is the enantiomeric excess of a 10.0 g/mL solution of phenylalanine which when placed in a standard 1.00 dm cell and analyzed in a polarimeter rotates plane polarized light -31.6 degrees?

specific rotation of a chiral compound is a physical property of that compound whereas observed rotation...

specific rotation of a chiral compound is a physical property of that compound whereas observed rotation is not. Explain

If a pure R isomer has a specific rotation of –146.0°, and a sample contains 80.0%...

If a pure R isomer has a specific rotation of –146.0°, and a sample contains 80.0% of the R isomer and 20.0% of its enantiomer, what is the observed specific rotation of the mixture?

The specific rotation of Compound X is -30.5 degrees. A mixture of Compound X and its...

The specific rotation of Compound X is -30.5 degrees. A mixture of Compound X and its enantiomer are placed in the polarimeter and the observed rotation is +5.1 degrees. Which enantiomer is in excess? (+ or -) Calculate the enantiomeric excess. Show your work. Calculate the percentage of each enantiomer in the mixture.

1-In specific factors model what would happen to the earnings of the specific factors of production...

1-In specific factors model what would happen to the earnings of the specific factors of production i.e. capital and land which cannot switch between industries? 2- what are the differences between absolute advantage and comparative advantage and which one of them is the foundation of international trade ?

Calculate specific rotation, %ee, and %R and %S using the data below Mass of product: 0.171...

Calculate specific rotation, %ee, and %R and %S using the data below Mass of product: 0.171 g Volume of solution: 5.00 mL Path length: 1.000 dm Observed rotation: 0.95 Thanks !!

Question