Une échelle de teintes en colorant E133 a été préparée par dilution mère. les concentrations en masses du colorant son indiqué ci-dessous. (échelle de teintes) : tube a: 4mg. L^-1
tube b: 6mg. L^-1
tube c: 8mg. L^-1
tube d: 10mg. L^-1

(Solution d'Alodont) :

t=?

Dans un tube a essai identique à ceux de l'échelle de teintes, on verse une solution d'Alodont contenant le colorant E133.

1) Nommer la méthode permettant de déterminer la concentration en masse de l'espèce coloré

2) Estimer la concentration en masse t en colorant E133 de la solution d'Alodont.

How could a student test the effect of removing heat from a gas that is stored in a sealed container? what must occur in order for matter to change states?

Which statement are accurate about snow flakes

The image compares the arrangement of electrons in two different neutral atoms. a figure labeled atom q has a shaded sphere at the center of three concentric circles. the innermost circle has two black spheres. the middle circle has six black spheres. to the left of this figure is another figure labeled atom p. atom p has a shaded sphere at the center of three concentric circles. the innermost circle has two black spheres. the middle circle has seven black spheres. which of the following best explains the position of the two atoms in the periodic table? atom p has an estimated zeff of 7 and is therefore to the left of atom q, which has a zeff of 6. atom p has an estimated zeff of 7 and is therefore to the right of atom q, which has a zeff of 6. atom p has an estimated zeff of 5 and is therefore below atom q, which has a zeff of 4. atom p has an estimated zeff of 5 and is therefore above atom q, which has a zeff of 4.