school
Acemy

Buffer Capacity

AP Chemistry· difficulty 4/5

To 1.0 L of buffer (0.20 M acetic acid / 0.20 M acetate), 0.010 mol HCl is added.

Before HCl: [HA]=0.20, [A⁻]=0.20 Add 0.010 mol HCl (1 L) After: [HA]=0.21, [A⁻]=0.19 pKa = 4.74

What is the new pH?

  • A

    5.00

  • B

    4.50

  • C

    4.74

  • D

    4.70

    check_circle

Explanation

pH = 4.74 + log(0.19/0.21) = 4.74 + (-0.044) = 4.70.

Want 10 more like this — adaptive to your weak spots?

Practice 10 like thisarrow_forwardPredict my AP score

Related questions

auto_awesomeAll Toolsquestion_answerHomework Q&Amenu_bookAP & SAT PreptimelineLearn Mode