Name:__________________________

Unknown Acid Problem: Bonus

Your company has just purchased a warehouse containing an old chemistry laboratory, and the first order of business is to take inventory of the chemicals in the stockroom so that you can properly dispose of them according to current EPA regulations. Unfortunately, the previous chemist did not label the bottles very thoroughly and left two bottles marked simply "acid" with no further information. Fortunately you find an old notebook in the lab with a table of the acids used by the previous chemist. (See table to the right).

You decide that you can collect some experimental data which will enable you to both (1) identify the unknown acids by comparison with the lab notebook information, and (2) determine their concentrations. Since the disposal of unidentified chemicals is more expensive than that of known compounds, a few hours of lab work can translate into considerable savings for your company.

Later in your inventory process, you come across a bottle labeled "mixed trichloroacetic and alloxanic acids". Looking up these compounds in a chemistry handbook, you find that trichloroacetic acid is a strong acid (pKa = 0.66) and the pKa for alloxanic acid is 6.63.

Use the Virtual Lab to identify the concentrations of the acids in this bottle. Summarize your findings in the spaces provided below the Virtual Lab interface.

You can submit your answers up to three times. If all three answers are incorrect, you will be given the correct answer and asked to reload the page and try a new problem. Enjoy your work! Please be aware that reloading the page will result in having to start a new problem.

Identify the concentrations of a mixture of two acids in solution: DONE

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