Thanks a bunch for the proposed solutions, but apparently they are both wrong. Before i posted here, i used the quadratic equation proposed by GCT; but that gave me very strange pH's indeed. It seems like the concentrations are so low that autodissociation of water (H2O ---> H3O+ +OH-) should be taken into consideration. I eventually found the solution in one of my former chemistry courses, so no need to pay my problem further heed. Nevertheless i'm grateful for your quick replies. Keep it up!
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