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What is the specific optical rotation of (S)-malic acid at a concentration of 5.5 g/ mL in the solvent pyridine at 20°C at a wavelength of 589 nm?

What is the specific optical rotation of (S)-malic acid at a concentration of 5.5 g/ mL in the solvent pyridine at 20°C at a wavelength of 589 nm? Correct Answer the specific rotation is –27°

The specific optical rotation of a sample, , is calculated using the equation given below, α (is the measured rotation in degrees, l is the path length in decimeters, and ρ (Greek letter “rho”) is the concentration of the liquid in g/mL, for a sample at a temperature T (given in degrees Celsius) and wavelength λ (in nanometers).

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