L'acier est un alliage (Fe+c).On trouve 6.43g d'acier par l'acide sulfurique concentrée pour transformer completement le fer en fe++ dans une solution de V=50ml (notée S) On prélève 10 ml de la solution (S) sur lequel on ajoute une solution de kMno4 0.03mlol. L-¹ en milieu acide , la décoloration cesse pour un volume versée dekMnO4=10 ml ; M(Fe)=56 g. Mol-¹ 1) Calculer [FE++] dans (S)

When the earth was formed and cooled, why did nickel and iron end up in the center of the earth while basalt and granite ended up in the outer layers

Which of the following statements is true? a. elements in the last period are radioactive. b. atomic weight is the same as atomic mass. c. elements in the same group have the same number of electron shells. d. atomic number equals the number of neutrons in the nucleus of an atom.

You encounter a solution that is acidic and you decide to test it by adding a small amount of a strong acid. the ph lowers slightly but is approximately unchanged, and still remains acidic. what can you say about the solution? a. it is a buffer solution. b. it is not a buffer solution it is a strong acid solution. d. the solution has been neutralized. e. the solution has excess acid present