Cho 28 gam sắt tác dụng với lượng dung axit sunfuric (H2SO4) tạo muối sắt (II) sunfat và khí hiđro. a) Viết phương trình phản ứng xảy ra.

b) Tính khối lượng axit tham gia phản ứng.

c) Tính khối lượng muối thu được sau phản ứng.

d) Cho khí hiđro thu được ở trên qua CuO vừa đủ, nung nóng. Sau khi phản ứng xảy ra hoàn toàn thu được m gam kim loại. Tính m.

Neither model is able to show the reactivity of potassium.

It is sure ( overimitation)

Answerthis solution will not form a precipitateexplanationsolubility equilbrium:         pbf₂(s)  ⇄ pb²⁺(aq) + 2 f⁻(aq)the solubility product expression is    (we exclude solids from the equilibrium expression).now suppose we have the trial ion product q, which we can define as    then, we can interpret  q as the product of the concentration of the ions that we have and ksp as the product of the ion concentrations that are needed to form a saturated solution.if q > ksp, then that implies that there will be a surplus of ions that exceed the amount that is required to form a saturated solution. a precipitate will then form (the precipitate continually  forms until the surplus ions are removed and q is decreased to ksp's value).if q = ksp, the saturated solution that forms is barely saturated and the precipitate will be minimal.if q < ksp, then the ion concentration will not be enough to form a saturated solution (so no precipitate).using our information, we calculate the trial ion product:     since q = 2.7  × 10⁻⁸ < ksp =  4  ×  10⁻⁸, a precipitate will not form.