Synthèse de Cannizzaro, bac Métropole 2021.

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• (2002) - A gritty, crime-ridden drama that explores the complexities of loyalty and family. • The Proposition (2005) - A visceral, Australian western that delves into the darker aspects of human nature. • The Assassination of Jesse James by the Coward Robert Ford (2007) - A contemplative, slow-burning biographical drama that reexamines a legendary murder. • The Wrestler (2008) - A poignant, unflinching portrayal of a professional wrestler's struggle with identity and mortality. • The Hurt Locker (2008) - A tense, critically acclaimed war thriller that plunges viewers into the world of bomb disposal. • The Town (2010) - A gripping, crime drama that explores the intricate web of relationships within a Boston crime syndicate. • Drive (2011) - A haunting, atmospheric neo-noir that probes the psyche of a enigmatic driver. • The Avengers of the End of the World (2012) - A quirky, offbeat comedy that reimagines the apocalypse. • The Act of Killing (2012) - A chilling, documentary exposé of the 1965 Indonesian massacre. • The Square (2013) - A thought-provoking, observational documentary that dissects the Egyptian Revolution. • The Wolf of Wall Street (2013) - A raucous, biographical comedy-drama that chronicles the excesses of stockbroker Jordan Belfort. • Nightcrawler (2014) - A dark, satirical exploration of the Los Angeles crime scene. • Ex Machina (2014) - A psychological, sci-fi thriller that probes the ethics of artificial intelligence. • The Lobster (2015) - A surreal, dystopian romantic comedy that challenges societal norms. • The Witch (2015) - A slow-burning, atmospheric horror film set in 17th-century New England. • Under the Shadow (2016) - A haunting, Iranian horror film that explores the psychological effects of war. • The Killing of a Sacred Deer (2017) - A tense, psychological thriller that probes the boundaries of guilt and responsibility. • You Were Never Really Here (2017) - A haunting, revenge drama that explores the complexities of trauma.

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3.1. Effectuer un schéma légendé de l'ampoule à décanter en précisant les phases présentes et leurs compositions respectives après décantation.

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3.2. Justifier le choix de l'éther éthylique.
L'eau et l'éther ne sont pas miscibles.
Le produit A, alcool benzylique, est très soluble dans l'ether et très peu soluble dans l'eau.
Le produit B, ion benzoate, est très soluble dans l'eau et insoluble dans l'éther.
3.3. Justifier que l'on veuille obtenir un pH inférieur à 2 pour la phase aqueuse.
pKa( acide benzoïque / ion benzoate = 4,2.
A pH < 2, l'acide benzoïque prédomine et celui-ci est insoluble dans l'eau.
3.4. Donner l'intérêt du bain de glace et d'eau.
La température de ce bain est égale à 0°C. La solubilité de l'acide benzoïque est très faible à °C.
3.5. Citer une technique permettant d'isoler le produit B de la phase aqueuse.
Filtration sur büchner.
3.6. En utilisant le chromatogramme, conclure sur l'efficacité de l'étape de séparation des produits.
3.7. En utilisant le chromatogramme, conclure sur la pureté des produits.
Le produit A n'est pas pur : il contient du benzaldehyde et de l'alcool benzylique.
Le produit B est pur, on l'identifie à l'acide benzoïque.


  
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