Chem word problem

  • Thread starter Zed
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  • #1
Zed
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chem word problem ! please help

Hi ,

This is a Hw question i have am stuck on i don't know how to solve it ...

A pharmacist is to prepare 16 milliliters of special eye drops for a glaucoma patient. The eye-drop solution must have a 5% active ingredient, but the pharmacist only has 10% solution and 1% solution in stock.


How much of 10% solution should be used to fill the prescription?

How much of 1% solution should be used to fill the prescription?


please help

thx
 

Answers and Replies

  • #3
Zed
6
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Borek said:
For theory:

http://www.chembuddy.com/?left=concentration&right=dilution-mixing

As the densities are not known, assume them to be 1 g/mL.

For fast calculations - try CASC (concentration calculator).

Best,
Borek
--
Chemical calculators at www.chembuddy.com
pH calculation
concentration conversion

thanks for ur reply... but i should solve this as a math word prolem not as a chemistry problem .. i mean an equation of the form : 0.03x + 0.10(16-x)= ...
 
  • #4
Gokul43201
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Science Advisor
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Assume the pharmacist uses x ml of 10% solution and 16 - x ml of 1% solution. Compare the total volume of active ingredient with the required number and solve for x.
 

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