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 pH of solution A, described below, followed by the pH of solution C. (Example: If the pH of solution A is 3.47 and that of solution C 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 25oC): Solution A is 50.0 mL of a 0.100 M solution of the weak monoprotic acid HX. Solution B is a 0.0500 M solution of the salt NaX. It has a pH of 10.02. Solution C is made by adding 15.0 mL of 0.250 M KOH to solution A. What is the combination to the safe?

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Chapter15: Acids And Bases
Section: Chapter Questions
Problem 15.19QP: Acids You make a solution by dissolving 0.0010 mol of HCl in enough water to make 1.0 L of solution....
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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 pH of solution A, described below, followed by the pH of solution C. (Example: If the pH of solution
A is 3.47 and that of solution C 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 25oC):
Solution A is 50.0 mL of a 0.100 M solution of the weak monoprotic acid HX.
Solution B is a 0.0500 M solution of the salt NaX. It has a pH
of 10.02.
Solution C is made by adding 15.0 mL of 0.250 M KOH to
solution A.
What is the combination to the safe?

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