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Voie_orale
Go to solution Solved by Echo,

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@Moine_copiste kikouuu!💚

Donc

 

tu as [Na+1] x [Cl-1] = 0,16

[Na+2] x [Cl-2] = 0,16 donc [Na+2] = 0,16/ 0,5 = 0,32

 

Na+2 est différent de Cl-2 or il faut une électroneutralité de la solution

 

Si la macromol > 0: Na2+ + 18Macromol = Cl-2

                                 0,32 + 18M = 0,5

                                            18M = 0,18

                                        M = 0,01

 

Si M <0 : Cl-2 + 18M = Na+2

                18M = -0,18 ---> concentration toujours positive donc c'est faux: la macromol est positive

 

Du coup D est fausse pcq la concentration de la Macromol est de 0,01 mol.L-1 et non 0,2

 

C'est assez clair pour toi?💚

                                

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