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annale 2017 qcm 3


LGB

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Bonjour,

Concernant le qcm 3 item E de l'annale 2017,

on parle d'une solution de CaNaNO3, quand j'ai fait l'equation de dissolution j'obtiens Ca2+ + Na+ + 3*(NO3-) et du coup je ne trouve pas 44 mosm/L. D'apres la correction du Tat, No3 donne l'ion No3 3- (et on trouve bien 44mosm/L) : cet ion existe t-il ? c'est pas NO3 - plutot ?

Merci d'avance 

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