A Lewis acid is a chemical species that can accept a pair of electrons to form a covalent bond. BF3 has an incomplete octet on the boron atom (only 6 electrons), making it an electron-deficient molecule and a strong Lewis acid. NH3, H2O, and OH- have lone pairs and act as Lewis bases.
Explanation:
Saline water (containing NaCl) increases the electrical conductivity of the water, accelerating the electrochemical process of rusting. This is why ships and coastal structures rust faster. Dry air and vacuum have no moisture; pure water without dissolved oxygen slows rusting.
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