Next, the second stage kicks in, and its five J-2 oxygen/hydrogen engines take the ship another 77 miles in six minutes. Then the third stage engine pushes the craft to the 17,500 mph required to escape Earth's gravitational pull and get into orbit.
Industrially, ferrous sulfate is mainly used as a precursor to other iron compounds. It is a reducing agent, and as such is useful for the reduction of chromate in cement to less toxic Cr(III) compounds. Historically ferrous sulfate was used in the textile industry for centuries as a dye fixative.
ferrous sulphate. n an iron salt with a saline taste, usually obtained as greenish crystals of the heptahydrate, which are converted to the white monohydrate above 100Â°C: used in inks, tanning, water purification, and in the treatment of anaemia.