Captain Kirk, of the Starship Enterprise, has been told by his superiors that only a chemist...

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" Captain Kirk, of the Starship Enterprise, has been told by his superiors that only a chemist can be trusted with the combination to the safe containing the dilithium crystals that power the ship. The combination is the pHpH of solution A described below, followed by the pHpH of solution C. (Example: If the pHpH of solution AA is 3.47 and that of solution CC is 8.15 , then the combination to the safe is 3-47-8-15). The chemist must determine the combination using only the information below (all solutions are at 25C25C ):
Solution A is 50.0 mL50.0 mL of a 0.100M0.100M solution of the weak monoprotic acid HX.
Solution B is a 0.0500M0.0500M solution of the salt NaXNaX. It has a pHpH of 10.02 .
Solution C is made by adding 15.0 mL15.0 mL of 0.250M0.250M KOHKOH to solution AA.
What is the combination to the safe?

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Chemical Principles

ISBN: 9780618946907

6th Edition

Authors: Steven S Zumdahl

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