Question

A beaker contains 350.0 mL of a 1.40 M unknown buffer solution. The unknown acid used to make the buffer has a pKa of 4.25 and the pH of the solution in the beaker is 4.02. What is the concentration of HA in the buffer solution? What is the concentration of A- in the buffer solution? If a student adds 10.00 mL of 1.30 M NaOH to the solution in the beaker, what is the new pH of the solution? (Report all of your answers to 3 decimal places without units)

Name: a beaker contains 3500 ml of a 140 m unknown buffer solution the unknown acid used to make the buffer has a pka of 425 and the ph of the solution in the beaker is 402 what is the concentrati 44817
Uploaded: 2022-01-10T09:40:04-08:00
Duration: 1 min 23 s
Channel: Dinesh Singh
Description: a beaker contains 3500 ml of a 140 m unknown buffer solution the unknown acid used to make the buffer has a pka of 425 and the ph of the solution in the beaker is 402 what is the concentrati 44817

          A beaker contains 350.0 mL of a 1.40 M unknown buffer
solution. The unknown acid used to make the buffer has a
pKa of 4.25 and the pH of the solution in the beaker is 4.02.
What is the concentration of HA in the buffer
solution?  What is the concentration of
A- in the buffer solution? If a student adds
10.00 mL of 1.30 M NaOH to the solution in the beaker,
what is the new pH of the solution?  (Report all
of your answers to 3 decimal places without units)

Added by David M.

Chemistry: Structure and Properties

Nivaldo Tro 2nd Edition

Instant Answer

Solved by Expert Dinesh Singh

01/10/2022

Step 1

02 = 4.25 + \log\left(\frac{[A^-]}{[HA]}\right)\] \[\log\left(\frac{[A^-]}{[HA]}\right) = -0.23\] \[\frac{[A^-]}{[HA]} = 10^{-0.23}\] \[[A^-] = 10^{-0.23}[HA]\] Show more…

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A beaker contains 350.0 mL of a 1.40 M unknown buffer solution. The unknown acid used to make the buffer has a pKa of 4.25 and the pH of the solution in the beaker is 4.02. What is the concentration of HA in the buffer solution? What is the concentration of A- in the buffer solution? If a student adds 10.00 mL of 1.30 M NaOH to the solution in the beaker, what is the new pH of the solution? (Report all of your answers to 3 decimal places without units)