when is down arrow used in a chemical reaction
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The up arrow being directed towards the top means that the compound or any gas that has been formed is “escaped” or “liberated” during a chemical reaction where as down arrow means that the compounds which is formed being insoluble is settled down , which we call in chemistry as “precipitates” out.
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down arrow in a chemical equation represents and signifies a precipitate formed by reaction of an acid and a base. this reaction is called precipitation/precipitate reaction.
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