Sonia B.

asked • 09/11/17

Calculate required volume...

Calculate the required volume of Stock 2 (20 mg/mL of ethanol) that you will need to add to each of five volumetric flasks so that when diluted to 100 mL each will yield the desired ethanol concentrations listed above. Be sure to label each flask carefully.

 Standard 1: 100 mL of 0.2 mg/mL ethanol and 2 mg/mL n-propanol in deionised water
 Standard 2: 100 mL of 0.5 mg/mL ethanol and 2 mg/mL n-propanol in deionised water
 Standard 3: 100 mL of 0.8 mg/mL ethanol and 2 mg/mL n-propanol in deionised water
 Standard 4: 100 mL of 1.0 mg/mL ethanol and 2 mg/mL n-propanol in deionised water
 Standard 5: 100 mL of 1.5 mg/mL ethanol and 2 mg/mL n-propanol in deionised water

1 Expert Answer

By:

Sonia B.

4. To make 1.0 mg/ml ethanol: (xml) (20mg/ml) = (100ml)(1.0 mg/ml) and x = 5 ml of the 20 mg/ml
5. To make 1.5 mg/ml ethanol: (xml) (20mg/ml) = (100ml)(1.5 mg/ml) and x = 7.5 ml of the 20 mg/ml
 
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09/11/17

J.R. S.

tutor
Yes.  Exactly like that.
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09/11/17

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