Property talk:P6272

Latest comment: 1 year ago by Petr Matas in topic Concentration

Documentation

specific rotation
angle through which plane-polarized light is rotated by an optically active substance or a solution of that substance
[create Create a translatable help page (preferably in English) for this property to be included here]
Type “chemical substance (Q79529): item must contain property “subclass of (P279)” with classes “chemical substance (Q79529)” or their subclasses (defined using subclass of (P279)). (Help)
List of violations of this constraint: Database reports/Constraint violations/P6272#Type Q79529, hourly updated report, SPARQL
Units: “degree (Q28390), degree square decimetre per kilogram (Q117188852): value unit must be one of listed. (Help)
List of violations of this constraint: Database reports/Constraint violations/P6272#Units, hourly updated report
Citation needed: the property must have at least one reference (Help)
List of violations of this constraint: Database reports/Constraint violations/P6272#citation needed, hourly updated report
Required qualifier “temperature (P2076): this property should be used with the listed qualifier. (Help)
List of violations of this constraint: Database reports/Constraint violations/P6272#mandatory qualifier, hourly updated report, SPARQL
Required qualifier “wavelength (P2808): this property should be used with the listed qualifier. (Help)
List of violations of this constraint: Database reports/Constraint violations/P6272#mandatory qualifier, hourly updated report, SPARQL
Required qualifier “solvent (P2178): this property should be used with the listed qualifier. (Help)
List of violations of this constraint: Database reports/Constraint violations/P6272#mandatory qualifier, hourly updated report, SPARQL
Required qualifier “concentration (P6274): this property should be used with the listed qualifier. (Help)
List of violations of this constraint: Database reports/Constraint violations/P6272#mandatory qualifier, hourly updated report, SPARQL

Units edit

In chemistry the most common unit is degree square decimetre per kilogram (Q117188852). Although it is often shortened to just "degree", it is not at all the simple degree (Q28390), which should be removed from allowed units.

The main SI unit is radian square metre per kilogram (Q96347983) or square metre per kilogram (Q86200529).

Maybe molar units, e.g. radian square metre per mole (Q96347486), could be allowed as well, although molar optical rotatory power (Q96346994) is a different quantity formally. This would allow us to include such values without conversion. — Petr Matas 20:17, 20 March 2023 (UTC)Reply

Concentration edit

Although the quantity angle of optical rotation (Q96323385) is proportional to concentration (in terms of mass per volume), specific rotation (Q2191631) is independent of it (at least for small concentrations). Therefore the qualifier concentration (P6274) should not be mandatory. — Petr Matas 20:28, 20 March 2023 (UTC)Reply

Return to "P6272" page.