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
motikmotik
3 years ago
9

Arbon dioxide is dissolved in blood (ph 7.5) to form a mixture of carbonic acid and bicarbonate. Part a neglecting free co2, wha

t fraction will be present as carbonic acid? (pka for h2co3 and hco3− are 6.3 and 10.25, respectively)
Chemistry
2 answers:
Temka [501]3 years ago
7 0

The fraction of carbonic acid in the blood is \boxed{0.0595}.

Further Explanation:

Buffer solution:

An aqueous solution of a weak acid or base and its conjugate base or acid respectively is known as buffer solutions. These show resistance in their pH values on the addition of small amounts of acid or base.

The given mixture contains carbonic acid and bicarbonate so it a buffer of a weak acid and its conjugate base.

Henderson-Hasselbalch equation is used to determine the pH of buffer solutions. The mathematical form of this equation for the given buffer is as follows:

{\text{pH}} = {\text{p}}{K_{\text{a}}} + {\text{log}}\dfrac{{\left[ {{\text{HCO}}_3^ - } \right]}}{{\left[ {{{\text{H}}_{\text{2}}}{\text{C}}{{\text{O}}_{\text{3}}}} \right]}}                                            …… (1)

Rearrange equation (1) as follows:

\log \dfrac{{\left[ {{\text{HCO}}_3^ - } \right]}}{{\left[ {{{\text{H}}_{\text{2}}}{\text{C}}{{\text{O}}_{\text{3}}}} \right]}} = {\text{pH}} - {\text{p}}{K_{\text{a}}}                                              …… (2)

The value of pH is 7.5.

The value of {\text{p}}{K_{\text{a}}} is 6.3.

Substitute these values in equation (2).

 \begin{aligned}\log \frac{{\left[ {{\text{HCO}}_3^ - } \right]}}{{\left[ {{{\text{H}}_{\text{2}}}{\text{C}}{{\text{O}}_{\text{3}}}} \right]}}&= {\text{7}}{\text{.5}} - 6.3\\&= 1.2\\\end{aligned}

Solving for the ratio of \left[ {{\text{HCO}}_3^ - } \right] to \left[ {{{\text{H}}_{\text{2}}}{\text{C}}{{\text{O}}_{\text{3}}}} \right],

\begin{aligned}\dfrac{{\left[ {{\text{HCO}}_3^ - }\right]}}{{\left[ {{{\text{H}}_{\text{2}}}{\text{C}}{{\text{O}}_{\text{3}}}}\right]}} &= {10^{1.2}}\\&= 15.8\\\end{aligned}  

This implies the concentration of {\text{HCO}}_3^ - is 15.8 times of that of {{\text{H}}_{\text{2}}}{\text{C}}{{\text{O}}_{\text{3}}}. So it can be written as follows:

\left[ {{\text{HCO}}_3^ - } \right]= 15.8{\text{ }}\left[ {{{\text{H}}_{\text{2}}}{\text{C}}{{\text{O}}_{\text{3}}}} \right]     …… (3)                                                                

The total mole fraction of {{\text{H}}_{\text{2}}}{\text{C}}{{\text{O}}_{\text{3}}} and {\text{HCO}}_3^ - is 1. So it can be written as follows:

\left[ {{{\text{H}}_{\text{2}}}{\text{C}}{{\text{O}}_{\text{3}}}} \right] + \left[ {{\text{HCO}}_3^ - } \right] = 1                                                               …… (4)

Substitute equation (3) in equation (4).

\begin{aligned}\left[ {{{\text{H}}_{\text{2}}}{\text{C}}{{\text{O}}_{\text{3}}}} \right] + 15.8{\text{ }}\left[ {{{\text{H}}_{\text{2}}}{\text{C}}{{\text{O}}_{\text{3}}}} \right]&= 1 \hfill\\16.8{\text{ }}\left[ {{{\text{H}}_{\text{2}}}{\text{C}}{{\text{O}}_{\text{3}}}} \right] &= 1 \hfill\\\end{aligned}  

Solve for the concentration of {{\text{H}}_{\text{2}}}{\text{C}}{{\text{O}}_{\text{3}}},

\begin{aligned}\left[{{{\text{H}}_{\text{2}}}{\text{C}}{{\text{O}}_{\text{3}}}} \right]&= \frac{1}{{16.8}}\\&= 0.0595\\\end{aligned}

Therefore the fraction of carbonic acid in the blood is 0.0595.

Learn more:

  1. The reason for the acidity of water brainly.com/question/1550328
  2. Reason for the acidic and basic nature of amino acid. brainly.com/question/5050077

Answer details:

Grade: High School

Chapter: Acid, base and salts.

Subject: Chemistry

Keywords: pH, buffer, 6.3, 7.5, 1.2, 0.0595, 15.8, weak acid, conjugate base, H2CO3, HCO3-.

Aleks04 [339]3 years ago
4 0

Answer : The fraction of carbonic acid present in the blood is 5.95%

Explanation :

The mixture consists of carbonic acid ( H₂CO₃) and bicarbonate ion ( HCO₃⁻). This represents a mixture of weak acid and its conjugate which is a buffer.

The pH of a buffer is calculated using Henderson equation which is given below.

pH = pKa + log \frac{[Base]}{[Acid]}

We have been given,

pH = 7.5

pKa of carbonic acid = 6.3

Let us plug in the values in Henderson equation to find the ratio Base/Acid.

7.5 = 6.3 + log \frac{[base]}{[acid]}

1.2 = log \frac{[base]}{[acid]}

\frac{[Base]}{[Acid]} = 10^{1.2}

\frac{[Base]}{[Acid]} = 15.8

[Base] = 15.8 \times [Acid]

The total of mole fraction of acid and base is 1. Therefore we have,

[Acid] + [Base] = 1

But Base = 15.8 x [Acid]. Let us plug in this value in above equation.

[Acid] + 15.8 \times [Acid] = 1

16.8 [Acid] = 1

[Acid] = \frac{1}{16.8}

[Acid] = 0.0595

[Acid] = 0.0595 x 100 = 5.95 %

The fraction of carbonic acid present in the blood is 5.95%

You might be interested in
The pressure that is the difference between the net hydrostatic pressure and the net colloid osmotic pressure is called
mina [271]

The pressure calculated as the difference between the net hydrostatic pressure and the net colloid osmotic pressure is known as: filtration pressure.

<h3>What is pressure?</h3>

Pressure can be defined as a measure of the force exerted per unit area of an object or body. Thus, it is usually measured in Newton per meter square.

<h3>The types of pressure.</h3>

In Science, there are different types of pressure and these include the following:

  • Hydrostatic pressure
  • Atmospheric pressure
  • Osmotic pressure
  • Filtration pressure

Filtration pressure is a pressure that is typically calculated as the difference between the net hydrostatic pressure and the net colloid osmotic pressure. Also, it promotes the filtration of fluid through a membrane.

Read more on pressure here: brainly.com/question/24827501

4 0
2 years ago
What the atmosphere mean
Alex_Xolod [135]
The envelope of gases surrounding the earth or another planet.
3 0
3 years ago
A 25.0 mL sample of an acetic acid solution is titrated with a 0.175 M NaOH solution. The equivalence point is reached when 26.6
joja [24]

<u>Answer:</u> The concentration of CH_3COOH comes out to be 0.16 M.

<u>Explanation:</u>

To calculate the concentration of acid, we use the equation given by neutralization reaction:

n_1M_1V_1=n_2M_2V_2

where,

n_1,M_1\text{ and }V_1 are the n-factor, molarity and volume of acid which is CH_3COOH

n_2,M_2\text{ and }V_2 are the n-factor, molarity and volume of base which is NaOH.

We are given:

n_1=1\\M_1=?M\\V_1=25mL\\n_2=1\\M_2=0.175M\\V_2=26.6mL

Putting values in above equation, we get:

1\times M_1\times 25=1\times 0.175\times 26.6\\\\M_1=0.1862M

Hence, the concentration of CH_3COOH comes out to be 0.1862 M.

4 0
3 years ago
Which list of elements consists of metalloids, only?
rewona [7]

Answer: D

Explanation: Boron (B), Silicon (Si), Germanium (Ge), Arsenic (As), Antimony (Sb), Tellurium (Te) and, Astatine (At) are all metalloids

4 0
3 years ago
Read 2 more answers
How do you think a country's GDP affects its citizen ability to consume
Aliun [14]
<span>The larger the GDP the better the overall economy of the country. It means more produced equals more for domestic consumption and hopefully an excess for export. It is essentially the production of wealth that will increase the standard of living for every citizen. Remember, GDP is the measure of the value of the gross domestic production of goods and services.</span>
4 0
3 years ago
Other questions:
  • What is the representative particle for barium chloride?
    6·2 answers
  • The overall charge of an atom is ________ if the number of electrons is ________ than the number of protons.
    5·1 answer
  • 1 l of gas at standard temperature and pressure is compressed to 473ml. what is the new pressure of the gas?
    13·1 answer
  • A gaseous fluorinated methane compound has a mass of 8.00 g at 2.81 atm and 300. K in a 1.00 L container.
    6·1 answer
  • Positive and Negative ions attract each-other and form chemical __________
    12·1 answer
  • What is the balanced equation for the single replacement reaction between potassium and copper (2) chloride
    6·1 answer
  • Nuclear power produces more toxic mercury than coal-burning power plants do.<br><br> True Or False?
    8·2 answers
  • What happened when bromine reacted with aluminum?
    6·1 answer
  • Which of the following have deliquescent Nature ? ​
    11·1 answer
  • In which part of the cell is the majority of the energy released from the breakdown of glucose
    13·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!