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== == While the fumes of muriatic acid (hydrochloric acid - HCl) are slightly heavier than air, the oxidation reaction is highly exothermic. The acid fumes will react with things in air, and generate heat. The heat generated causes gases to rise, so muriatic acid co-oxidant gases will fill the surrounding space. Fumes also mix quickly without heat due to diffusion. A link can be found below to the Wikipedia post on hydrochloric acid. If you are using concentrated acid in still dry air the fumes will not be too bad however you should stil take care. However if you use the stuf in cool conditions especialy in the morning with mist in the air the area around you will soon become a toxic cloud of acid vapor.

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βˆ™ 2009-02-15 07:32:22
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Q: If using muriatic acid do the fumes rise or stay near the ground without air movement?
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