paramètre influençant la couleur d'une substance


Comment déterminer la couleur d’une solution?

De nombreuses substances chimiques prennent en solution une couleur qui dépend des conditions de pH. Cette propriété est mise à profit pour déterminer les caractéristiques des solutions en y introduisant l’indicateur sous forme de solution ou bien en utilisant une bandelette de papier imbibée d’indicateur : le papier-pH.

Pourquoi la couleur d’une substance peut-elle varier ?

La couleur de la substance peut varier lorsque le pH varie : c’est le cas des indicateurs colorés. La couleur d’une substance peut varier lorsque le solvant est différent. C’est la structure de la molécule qui explique le changement de couleur.

Qu'est-ce que la couleur d'une substance colorée ?

Une substance colorée absorbe une partie des rayonnements lumineux et diffuse la couleur complémentaire des radiations absorbées. La couleur de la substance peut varier lorsque le pH varie : c’est le cas des indicateurs colorés. La couleur d’une substance peut varier lorsque le solvant est différent.

Quelle est la couleur de l’inconscient ?

L’iindigo : c’est la couleur de l’inconscient. Il invite à s’intérioriser. Le violet : c’est la couleur du passage, de la transition. Il invite au respect et à la dignité.Il exprime la sagesse et la sérénité. Le blanc : c’est le symbole la pureté et de la loyauté.

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