Recent Examples on the WebThe battery is a manganese-hydrogen battery, and it’s made by dissolving manganese sulfate, a common salt, in water. Avery Thompson, Popular Mechanics, 7 May 2018 This step, called reverse osmosis, removes ions smaller than magnesium and sulphate, particularly the sodium and chloride ions that make up common salt and that give seawater its characteristic taste.The Economist, 3 May 2018