L’épreuve de physique-chimie, sur laquelle 34 % des lycéens plancheront le 11 ou le 12 mai, de 14 h à 17 h 30, comporte trois exercices indépendants. Ils traitent des thématiques abordées lors des ...
An acid-base indicator is a substance that changes color as the pH of the solution changes. Indicators work because they are weak acids which when in solution, exist in equilibrium with their ...
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