Multiple Choice
What volume of 0.855 M KOH solution is required to make 3.55 L of a solution with a pH of 12.4?
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17. Acid and Base Equilibrium
pH of Strong Acids and Bases
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What is the pH of a 2.8 M solution of HClO_4, assuming complete dissociation?
A
-0.45
B
1.45
C
2.80
D
0.55
Verified step by step guidance1
Recognize that HClO_4 (perchloric acid) is a strong acid, which means it completely dissociates in water. Therefore, the concentration of H^+ ions is equal to the initial concentration of HClO_4, which is 2.8 M.
Write the expression for pH, which is defined as \(\mathrm{pH} = -\log[\mathrm{H}^+]\).
Substitute the concentration of hydrogen ions into the pH expression: \(\mathrm{pH} = -\log(2.8)\).
Calculate the logarithm of 2.8 (you can use a calculator or logarithm tables) to find the value of \(\log(2.8)\).
Apply the negative sign to the logarithm value to find the pH of the solution.
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