Math / Chemistry Question

  • Thread starter Rich_E2
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  • #1
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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
 

Answers and Replies

  • #2
1,065
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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
 
  • #3
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I'm terrible at math.

Does anyone know the answer?

Thanks.
 
  • #4
morrobay
Gold Member
767
221
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
 
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