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Optical Purity Formula

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The Optical Purity is a comparison of the optical rotation of a pure sample of unknown stereochemistry versus the optical rotation of a sample of pure enantiomer. Check FAQs

OP = (\frac{[α] obs}{[α] max}) \cdot 100

OP - Optical Purity?[α]_obs - Observed Specific Rotation?[α]_max - Maximum Specific Rotation?

Optical Purity Example

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Here is how the Optical Purity equation looks like with Values.

Here is how the Optical Purity equation looks like with Units.

Here is how the Optical Purity equation looks like.

75 = (\frac{45}{60}) \cdot 100

75 = (\frac{45deg.mL.g⁻¹.dm⁻¹}{60deg.mL.g⁻¹.dm⁻¹}) \cdot 100

75 = (\frac{45}{60}) \cdot 100

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Optical Purity Solution

Follow our step by step solution on how to calculate Optical Purity?

FIRST Step Consider the formula

OP = (\frac{[α] obs}{[α] max}) \cdot 100

Next Step Substitute values of Variables

∴

OP = (\frac{45deg.mL.g⁻¹.dm⁻¹}{60deg.mL.g⁻¹.dm⁻¹}) \cdot 100

Next Step Convert Units

∴

OP = (\frac{0.0079rad.m³.kg⁻¹.m⁻¹}{0.0105rad.m³.kg⁻¹.m⁻¹}) \cdot 100

Next Step Prepare to Evaluate

∴

OP = (\frac{0.0079}{0.0105}) \cdot 100

Next Step Evaluate

∴

OP = 75.0000000000001

LAST Step Rounding Answer

∴

OP = 75

Optical Purity Formula Elements

Variables

Optical Purity

The Optical Purity is a comparison of the optical rotation of a pure sample of unknown stereochemistry versus the optical rotation of a sample of pure enantiomer.

Symbol: OP

Measurement: NAUnit: Unitless

Note: Value can be positive or negative.

Formulas to find Optical Purity

Observed Specific Rotation

Observed Specific Rotation is the change in orientation of monochromatic plane-polarized light in a mixture.

Symbol: [α]_obs

Measurement: Specific RotationUnit: deg.mL.g⁻¹.dm⁻¹

Note: Value can be positive or negative.

Formulas to find Observed Specific Rotation

Maximum Specific Rotation

Maximum Specific Rotation is the specific rotation of the pure enantiomer.

Symbol: [α]_max

Measurement: Specific RotationUnit: deg.mL.g⁻¹.dm⁻¹

Note: Value can be positive or negative.

Formulas to find Maximum Specific Rotation

Other formulas in Optical Activity category

Go Specific Rotation of Optically Active Compound

[α] D = \frac{α}{l \cdot c}

Go Enantiomeric Excess

ee = | F R - F S |

Go Percent Enantiomeric Excess

%ee = | F R - F S | \cdot 100

Go Fraction of Major Isomer

F R = 50 + (\frac{%ee}{2})

How to Evaluate Optical Purity?

Optical Purity evaluator uses Optical Purity = (Observed Specific Rotation/Maximum Specific Rotation)*100 to evaluate the Optical Purity, The Optical Purity formula is defined as a comparison of the optical rotation of a pure sample of unknown stereochemistry versus the optical rotation of a sample of pure enantiomer. It is a measure of the proportion of one enantiomer in a mixture of enantiomers. Optical Purity is denoted by OP symbol.

How to evaluate Optical Purity using this online evaluator? To use this online evaluator for Optical Purity, enter Observed Specific Rotation ([α]_obs) & Maximum Specific Rotation ([α]_max) and hit the calculate button.

FAQs on Optical Purity

What is the formula to find Optical Purity?

The formula of Optical Purity is expressed as Optical Purity = (Observed Specific Rotation/Maximum Specific Rotation)*100. Here is an example- 75 = (0.00785398163397301/0.010471975511964)*100.

How to calculate Optical Purity?

With Observed Specific Rotation ([α]_obs) & Maximum Specific Rotation ([α]_max) we can find Optical Purity using the formula - Optical Purity = (Observed Specific Rotation/Maximum Specific Rotation)*100.

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Optical Purity Formula

Optical Purity Example

Optical Purity Solution

Optical Purity Formula Elements

Other formulas in Optical Activity category

How to Evaluate Optical Purity?

FAQs on Optical Purity

Variable Name