Answer to Question #283376 in Chemistry for Helia

Question

You have been asked to prepare a solution which contains 70% of acetonitrile and of 30% H2O. Moreover, the

aqueous portion should contain 1% of trifluoroacetic acid (TFA) . The volume of this solution is to be 20 mL.

However, only a dilute solution of 5% is available within the laboratory.

What volume of H20 and TFA should be used, respectively?

Answer 1

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