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Adding Water to Acid is Dangerous

Water is added to an acid solution, resulting in dangerous splattering. Safety concerns relating to mixing are discussed.

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The demonstration on this page shows a technique that should not be used by undergraduate chemistry laboratory students.

Discussion

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Water is added to an acid solution, resulting in splattering. When mixing acid and water, always add the acid to the water, and add it slowly. Never add the water to the acid. (To help you remember, note that "Acid to Water" has the first letters of the words in alphabetical order.)

Sometimes, heat is evolved when substances are mixed. Always have a place to set a vessel that gets too hot to handle. An easily available test tube rack and an area cleared of notebooks, glassware, and other items are important in the laboratory.

When mixing or heating, NEVER point the mouth of a test tube or Erlenmeyer flask at yourself or another person! ALWAYS direct the mouth away from people!