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Math / Chemistry Question

  1. Nov 27, 2011 #1
    Hello, I need your help on a calculation...

    I have 200 milligram dissolvable tablets, and a 3 ounce dropper bottle of water. How many tablets would I need to add to the water to make a 2% solution?

    The chemistry/math is a bit confusing to me because the tables are measured in mass (i.e. mg), whereas water is measured in volume (i.e. oz.).

    Thanks in advance for your help

    -Rich
     
  2. jcsd
  3. Nov 28, 2011 #2
    It would help if you had everything in the same systems of units...leave your tablets in milligrams but convert your bottle of water from ounces into grams (or milligrams)...things should then get easier
     
  4. Nov 29, 2011 #3
    I'm terrible at math.

    Does anyone know the answer?

    Thanks.
     
  5. Nov 29, 2011 #4

    morrobay

    User Avatar
    Gold Member

    one liter of water contains 1000 grams = 1000 ml
    one 200 milligram tablet = .2 grams
    so 100 tablets = 20 grams
    20g/1000g = 2% solution

    3 oz = 88.5 ml
    so x / 88.5 = 100 / 1000
    so you add 8.85 ( 200 mg ) tablets / 3 oz water = 2% solution
     
    Last edited: Nov 29, 2011
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