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
Leviafan [203]
3 years ago
14

A certain buffer is made by mixing a weak acid HA and its conjugate base A–. When HA is present at a concentration of 0.5 mM and

A– is present at a concentration of 0.1 mM, the buffer has a pH of 6.16. Calculate the ratio of the concentrations of HA and A– when the buffer has a pH of 7.02.
Biology
1 answer:
MAVERICK [17]3 years ago
7 0

Answer:The ratio of the concentrations of HA  and A^- when the buffer has a pH of 7.02 is 0.69

Explanation:

The dissociation constant for formic acid = K_a=1.8\times 10^{-4}

Concentration of HA= 0.5 mM

Concentration of A^-= 0.1 mM

pH = 6.16

First we have to calculate the value of K_a.

Using Henderson Hesselbach equation :

pH=pK_a+\log \frac{[A^-}{[HA]}

Now put all the given values in this expression, we get:

6.16=pK_a+\log (\frac{[0.1]}{0.5})

pK_a=6.86

To calculate the ratio of the concentrations of HA  and A^- when the buffer has a pH of 7.02.

Using Henderson Hesselbach equation :

7.02=6.86+\log \frac{[A^-]}{[HA]}

7.02=6.86+\log \frac{[A^-]}{[HA]}

\frac{[A^-]}{[HA]}=1.44

\frac{[HA]}{[A^-]}=0.69

Thus the ratio of the concentrations of HA  and A^- when the buffer has a pH of 7.02 is 0.69

You might be interested in
Is the table linear or nonlinear with the numbers -4 -2 0 2 8 6 2 -2
slega [8]
The table is not linear.
4 0
2 years ago
Which is a kingdom?<br> O A. Animalia<br> O B. Eukarya<br> C. Mammalia<br> O D. Prokarya
Alika [10]
The answer to this is A
8 0
3 years ago
Read 2 more answers
HELP PLEASE NOW I GOT TUTORING AT 6:00 PLEASE HELP!!!!! THIS IS URGENT
Zinaida [17]
It is B.Hope it helps :)

4 0
3 years ago
Identify the structure in blood that transports oxygen to body cells.
Alexeev081 [22]

Answer:

Red blood cells

6 0
3 years ago
Read 2 more answers
9. Describe one way you use scientific "problem solving" thinking skills in
Olin [163]

Answer:

<u><em>Everyone needs critical thinking</em></u>

We all encounter opportunities in our daily lives to engage problems and decisions using strong critical thinking. Everyone needs to think ahead, to plan and to problem solve. In fact, strong thinking is the common denominator of success throughout the world.  It’s easy to find examples of  critical thinking skills being applied, everyday, in everyday life.

<u><em></em></u>

<u><em>Here are fifteen positive examples of critical thinking</em></u>:

A person trying to interpret an angry friend’s needs, expressed through a rush of emotion and snide comments, to give that friend some help and support.

A manager trying to be as objective as possible when settling a dispute by summarizing the alternatives, with fairness to all sides to a disagreement.

A team of scientists working with great precision through a complex experiment in an effort to gather and analyze data.

A creative writer organizing ideas for the plot of a story and attending to the complex motivations and personalities of the fictional characters.

A person running a small business trying to anticipate the possible economic and human consequences of various ways to increase sales or reduce costs.

A master sergeant and a captain working out the tactical plans for a dangerous military mission.

A soccer coach working during halftime on new tactics for attacking the weaknesses of the other team when the match resumes.

A student confidently and correctly explaining exactly to his or her peers the methodology used to reach a particular conclusion, or why and how a certain methodology or standard of proof was applied.

An educator using clever questioning to guide a student to new insights.

Police detectives, crime scene analysts, lawyers, judges, and juries systematically investigating, interrogating, examining, and evaluating the evidence as they seek justice.

A policy analyst reviewing alternative drafts of product safety legislation while determining how to frame the law to benefit the most people at the least cost.

An applicant preparing for a job interview thinking about how to explain his or her particular skills and experiences in a way that will be relevant and of value to the prospective employer.

Parents anticipating the costs of sending their young child to college, analyzing the family’s projected income, and budgeting projected household expenses in an effort to put aside some money for that child’s future education.

A financial planner anticipating the impact of new income tax legislation on a client’s future tax liabilities.

A first responder coming upon the scene of an accident and quickly analyzing the situation, evaluating priorities, and inferring what actions to take in what order.

<h2>HOPE THIS HELPS!!</h2>

5 0
2 years ago
Other questions:
  • With the example of the GMO mosquito being introduced into a population of mosquitos
    15·1 answer
  • How has urbanization changed land,air and water quality
    5·1 answer
  • What is the difference between biology and physics
    14·1 answer
  • Humans use what to pass on desired phenotypic traits to the next generation of organisms.
    6·2 answers
  • What will happen if all water on earth (even in our bodies) went away for 3 seconds
    11·2 answers
  • Which of the following lists the parts of a reflex are in the corret order?
    9·1 answer
  • A student is making a table to show the ways in which cell structures help to maintain homeostasis. Which cell structure
    11·1 answer
  • Which statement is true about all adaptations?
    15·1 answer
  • What is the journey of oxygen through our lungs?
    14·1 answer
  • What does the nucleosome<br> do?
    11·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!