1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
iris [78.8K]
3 years ago
13

A buffer solution contains 0.345 M acetic acid and 0.377 M sodium acetate . If 0.0613 moles of potassium hydroxide are added to

250 mL of this buffer, what is the pH of the resulting solution ? (Assume that the volume does not change upon adding potassium hydroxide. )
Chemistry
1 answer:
melamori03 [73]3 years ago
6 0

Answer:

pH = 5.54

Explanation:

The pH of a buffer solution is given by the <em>Henderson-Hasselbach (H-H) equation</em>:

  • pH = pKa + log\frac{[CH_3COO^-]}{[CH_3COOH]}

For acetic acid, pKa = 4.75.

We <u>calculate the original number of moles for acetic acid and acetate</u>, using the <em>given concentrations and volume</em>:

  • CH₃COO⁻ ⇒ 0.377 M * 0.250 L = 0.0942 mol CH₃COO⁻
  • CH₃COOH ⇒ 0.345 M * 0.250 L = 0.0862 mol CH₃COOH

The number of CH₃COO⁻ moles will increase with the added moles of KOH while the number of CH₃COOH moles will decrease by the same amount.

Now we use the H-H equation to <u>calculate the new pH</u>, by using the <em>new concentrations</em>:

  • pH = 4.75 + log\frac{(0.0942+0.0613)mol/0.250L}{(0.0862-0.0613)mol/0.250L} = 5.54
You might be interested in
What will be the charge of an atom containing eight protons, nine neutrons, and 10 electrons?
Wittaler [7]
The charge would be -2 because there are 2 more electrons than protons, and electrons have a negative charge.
6 0
3 years ago
If the amount of Adams if each type on the left and right sides of a reaction difference what must be done to balance it
Ivanshal [37]

Hey there,

Your answer would be

Coefficients are placed in front of the reactants and/or products

Hope this helps,

<h2>- <em>Mr. Helpful</em></h2>

8 0
3 years ago
2. What is the current running through a toaster if the resistance is 15
pogonyaev
I’ll help you 8n a bit
8 0
3 years ago
Please answer asap need it by Wednesday morning
yarga [219]
The answer to this problem is quite simple, it’s 9
4 0
3 years ago
What is the H+ in solution with pH of 10.9
Soloha48 [4]

Answer:

Explanation:

has a pH of 6.6, then what is the H3O+ in solution X? View Answer · What is the pOH of a solution in which (H+)

8 0
3 years ago
Other questions:
  • Negatively charged particles within the atom are called what?
    15·1 answer
  • Which is an example of negative phototropism?
    5·2 answers
  • 5 What is the concentration of a 25.0 mL HCl solution containing a phenolphthalein indicator that is titrated with 0.1 M NaOH if
    5·2 answers
  • This chemical equation is balanced.
    13·1 answer
  • Explain the electrolysis of an aqueous solution. (What is produced at each electrode and why its produced) Thank you ​
    13·1 answer
  • A balloon contains 5 L of oxygen at a pressure of 90 kPa. How much oxygen will the balloon contain if the pressure is lowered to
    13·1 answer
  • Identify the power of ten that defines each of these prefixes. Input your answers as 10 x where x is the power of ten. nano- ___
    7·1 answer
  • Oceans cover over 70% of Earth's surface, and precipitation constantly adds freshwater to the oceans. Yet, ocean levels remain r
    7·2 answers
  • Oil is more dense than water. How will this affect the weight of objects that will float on it?
    9·1 answer
  • You drop a rock weighing 23.2 g into a graduated cylinder that contains 55 mL. The level of the water rises to 62 mL. What is th
    12·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!