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The chemical equation above describes the neutralization reaction between hydrochloric acid (HCl) and barium hydroxide (Ba(OH)2) to form barium chloride (BaCl2) and water (H2O).
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Reaction conditions: The reaction occurs at standard temperature and pressure. HCl and Ba(OH)2 must be in solution to be able to contact and react with each other.
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Reaction process: When HCl reacts with Ba(OH)2, the H+ ion of HCl will react with the OH- ion of Ba(OH)2 to form water H2O, while the Ba2+ ion of Ba(OH)2 will react with the Cl- ion of HCl to form salt BaCl2.
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Phenomenon occurs: When the two substances react with each other, a white precipitate of BaCl2 salt will appear. If the reaction is complete, the solution will no longer have a sour (due to HCl) or bitter (due to Ba(OH)2) taste.