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.
1 Ferrous gluconate is used to treat anaemia (not enough red blood cells in the blood). 2  It is an iron-containing drug, and is sometimes known as an oral iron salt or iron.3  It is used to treat anaemia caused by a deficiency of iron.ERROUS GLUCONATE PRECAUTIONS. Before taking ferrous gluconate, tell your doctor or pharmacist if you are allergic to it; or to other drugs containing iron; or if you have any other allergies. This medication should not be used if you have certain medical conditions.