Sonia B.

asked • 09/10/17

Chemistry question calculation

If you are provided a stock solution of 15 mg/L of ethanol how much of this solution would you need to transfer to a 50 mL volumetric flask to produce a solution of concentration 1 mg/L?

1 Expert Answer

By:

Sonia B.

Hello can you please help me with this calculation:
 
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

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.
Report

09/11/17

J.R. S.

tutor
I'll do a few of them on the already submitted question and hopefully you can do the rest.
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09/11/17

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