AP CHEM Unit 8 Day 1 Review

What is the best approximation of the pKa of the weak acid in this titration?
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A 10.0 mL sample of an unknown concentration of a monoprotic weak acid is titrated with 0.10 M NaOH and the pH is monitored with a pH meter as shown in the graph below.  A weak acid of unknown molarity is titrated with NaOH. The graph above was obtained. At which point on the titration curve is [A-] closest to TWICE that of [HA]?

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A 10.0 mL sample of an unknown concentration of a monoprotic weak acid is titrated with 0.10 M NaOH and the pH is monitored with a pH meter as shown in the graph below.  A weak acid of unknown molarity is titrated with NaOH. The graph above was obtained. At which point on the titration curve is [A-] equal to that of [HA]?

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• B
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• D

The curve shown represents the titration of 25mL of 0.10M NH₃ with 0.10M HCl.  After which volume of HCl added will there be more NH₃ than NH₄⁺?
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• 10mL
• 20mL
• 30mL
• 40mL

A 0.10M HCl solution may be titrated with two different bases: 0.10M NaOH or 0.10M Ca(OH)₂.  Which statement best describes the volumes of the bases necessary to reach the equivalence point?
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• Half as much NaOH is needed.
• Equal volumes of NaOH and Ca(OH)₂ are needed.
• Twice as much Ca(OH)₂ is needed.
• Twice as much NaOH is needed.