Q&A for How to Dilute an Acid

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  • Question
    How do you dilute acids safely?
    Chris Hasegawa, PhD
    Retired Science Professor & Dean
    Dr. Chris Hasegawa was a Science Professor and the Dean at California State University Monterey Bay. Dr. Hasegawa specializes in teaching complex scientific concepts to students. He holds a BS in Biochemistry, a Master’s in Education, and his teaching credential from The University of California, Davis. He earned his PhD in Curriculum and Instruction from The University of Oregon. Before becoming a professor, Dr. Hasegawa conducted biochemical research in Neuropharmacology at the National Institute of Health. He also taught physical and life sciences and served as a teacher and administrator at public schools in California, Oregon, and Arizona.
    Retired Science Professor & Dean
    Expert Answer
    Double-check your calculations and measurements before you dilute anything.
  • Question
    When I dilute acid should I add acid to water or water to acid?
    Community Answer
    You should always add acid to water, otherwise you will end up with an extremely exothermic reaction that can even boil the water and cause violent bumping that can result in acid splashing all over the place.
  • Question
    Is it possible to measure acid in ppm?
    Jomari Cabato
    Community Answer
    To convert from molarity to ppm, first determine the molar mass of a substance. For instance, chloride has a molar mass of 35.5. A solution with 1 M concentration would have 35.5 g of chloride per 1 L of solution.
  • Question
    What is the acetic acid formula?
    Community Answer
    The acetic acid, also known as ethanoic acid, has the formula C2H4O2, or CH3COOH.
  • Question
    Why is dilution important?
    Community Answer
    Dilution can help save chemicals! So it can be cheaper. Also, some experiments do not require such concentrated solutions. If we want to see titration happen, using diluted acids would be better than using concentrated acids. For example, during titration, we can see the change of acidity happen gradually and find a more exact amount needed to make the solution neutral. (You should dilute the alkali too.) Moreover, students who are just learning to experiment with acids for the first time may not be very careful. Undiluted acids may hurt them as they may accidentally spill the acid and burn themselves.
  • Question
    What does 0.1M of a solution mean?
    Hannah
    Community Answer
    The M stands for molar concentration or molarity, and is given in mol/L. In this case it means there are 0.1 moles of a certain substance in 1 liter of the solution.
  • Question
    When diluting an acid, what causes an explosion when you pour acid into water instead of the other way around?
    Community Answer
    You probably poured too much acid into a small amount of water at a time, or the water was simply hot or lukewarm. This can result in an exothermic reaction. Also, if the acid you had was oleum (supersaturated sulphuric acid), then adding it to any quantity of water will cause an explosion, no matter the amount of water.
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