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
Novosadov [1.4K]
3 years ago
5

Suppose that you have 125 mL of a buffer that is 0.140 M in both hydrofluoric acid ( HF ) and its conjugate base ( F − ) . Calcu

late the maximum volume of 0.370 M HCl that can be added to the buffer before its buffering capacity is lost.
Chemistry
1 answer:
pshichka [43]3 years ago
8 0

Answer:

38,7mL of HCl 0,370M

Explanation:

The buffering capacity is lost when the pH of the solution is out of pka ± 1.

For the buffer:

HF ⇄ H⁺ + F⁻; pka = 3,20

Moles of both HF and F⁻ are:

HF: 0,140M ₓ 0,125L = 0,0175 moles of HF

Moles of F⁻ are the same.

Using Henderson-Hasselbalch formula:

pH = pka + log₁₀ F⁻ / HF

pH = 3,20 + log F⁻ / HF <em>(1)</em>

The addition of X moles of HCl (H⁺) shift the equilibrium to the left, thus:

         HF             ⇄   H⁺  +     F⁻

0,0175 moles + X             0,0175 moles - X          

The buffer lost its capacity when pH = 3,20 - 1 = 2,20. Thus, replacing in (1):

2,20 = 3,20 + log ₁₀0,0175 - X / 0,0175 + X

0,1 = 0,0175 - X / 0,0175 + X

0,00175 + 0,1X = 0,0175 - X

-0,01575 = -1,1X

<em>0,0143 moles = X</em>

You need to add 0,0143 moles of HCl. In volume for a concentration of 0,370M HCl:

0,0143 moles ÷ 0,370M = 0,0387L of HCl 0,370M ≡ <em>38,7mL of HCl 0,370M</em>

I hope it helps!

You might be interested in
Nutritional biochemists have known for decades that acidic foods cooked in cast-iron cookware can supply significant amounts of
podryga [215]

The number of ferrous ions present in jar are 3.1x 10^21.

<h3>Steps</h3>

Since we have 737 g, 5,896 servings are generated.

If one serving contains 49 mg of iron, then one can contains 49*5,896 mg of iron.

In other words, if made in a cast-iron pot, one jar of tomato sauce has 288,9 mg of iron.

The number of ferrous ions present in jar are 3.1x 10^21.

<h3>What exactly does nutritional biochemistry mean?</h3>

Nutritional biochemistry is the study of nutrition as a science that deals with physiology, medicine, microbiology, pharmacology, chemistry, and biology and uses these sciences for the investigation of health, diet, and nutrition as well as the research of disease and the administration of medications.

<h3>What does nutritional biochemistry teach you?</h3>

This covers a fundamental knowledge of molecular genetics, biostatistics, epidemiology, and metabolism. Learn the laboratory skills necessary for current biochemical and molecular investigations into diet and its impact on health and illness.

learn more about biochemist here

brainly.com/question/2256082

#SPJ4

4 0
1 year ago
Why do oxygen and sulfur have similar chemical properties?
Step2247 [10]

Answer:

Oxygen and sulfur have similar chemical properties because both elements have six electrons in their outermost electron shells. Indeed, both oxygen and sulfur form molecules with two hydrogen atoms: water and hydrogen sulfide

Explanation:

3 0
2 years ago
650.J is the same amount of energy as? <br>2720cal<br>1550cal<br>650.cal<br>2.72cal
Oksi-84 [34.3K]

<u>Ans: 650 J = 155 calories</u>


<u>Given:</u>

Energy in joules = 650 J

<u>To determine:</u>

The energy in calories

<u>Explanation:</u>

1 joule = 0.2388 calories

Therefore, 650 joules = 0.2388 calories * 650 J/1 J = 155 calories

4 0
3 years ago
Read 2 more answers
Find the volume of an object that has a mass of 20g and density of 184 glcm
expeople1 [14]
Volume= Mass/ Density= 20/184
= 0.108 cubic cm
8 0
3 years ago
What happens when air moves from an area of high pressure to an area of low pressure?
tino4ka555 [31]

Answer: The answer is D. wind is created. :)

8 0
3 years ago
Read 2 more answers
Other questions:
  • The structures within the cytoplasm of a eukaryotic cell is what
    8·1 answer
  • The gaia hypothesis is an example of
    10·2 answers
  • During a titration, a known concentration of _____ is added to a _____ of an unknown concentration g
    9·1 answer
  • Wanted to measure the pressure of oxygen gas in a closed container. She measured pressure at four points; at the top, bottom, le
    8·1 answer
  • WILL MARK BRANLIEST FOR CORRECT ANSWER! Given the following equation, write the expression for its relative rate.
    6·1 answer
  • You have been sent a sample of aspirin to analyse for impurities. Describe how you could
    6·1 answer
  • All the radioactive elements are found in the last group of the Periodic Table.
    13·2 answers
  • How many molecules and atoms in 6 moles of P203?
    9·1 answer
  • Someone pls help me I will make you brain
    8·2 answers
  • SOMEONE PLEASE HELP ME WILL MARK BRAINLIEST PLEASE!!
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!