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
How many water molecules self ionize in one liter of water
Drupady [299]

Answer:

yes

Explanation:

because I think it is correct fo u

5 0
3 years ago
How many moles of copper are needed to react with sulfur to produce 0.25 moles of copper sulfide
Setler [38]
                                        Cu + S ---> CuS
by reaction                      1 mol           1 mol
from the problem         0.25 mol        0.25 mol
 0.25 mol   Cu
6 0
3 years ago
Read 2 more answers
According to the principle of the conservation of mass the mass of the sodium sulfate was the following PLS HELP I NEED TO TURN
Annette [7]

Answer:

Explanation:

The Law of Conservation of Mass is defined and explained using examples of reacting mass calculations using the law are fully explained with worked out examples using the balanced symbol equation. The method involves reacting masses deduced from the balanced symbol equation.

5 0
3 years ago
How many moles of aluminum oxide (Al2O3) can be produced from 12.8 moles of oxygen gas (02)
zhannawk [14.2K]

Answer:

Theoretical Yield

Percent yield

Example stoichiometry problem

How much oxygen can be prepared from 12.25 g KClO3 . (Use molar mass KClO3 = 122.5 g.)

Most stoichiometry problems can be solved using the following steps.

Step 1.

Write and balance the equation for the decomposition of KClO3 with heat (∆). 2KClO3 + ∆ → 2KCl + 3O2

Step 2.

Convert what you have (in this case g KClO3) to moles.

# moles = grams/molar mass = 12.25 g /122.5 = 0.100 mole KClO3.

Step 3.

Using the coefficients in the balanced equation, convert moles of what you have (moles KClO3) to moles of what you want (in this case moles oxygen).

0.100 mol KClO3 x (3 moles O2/2 moles KClO3) = 0.100 x (3/2) = 0.150 mole O2.

Step 4.

Convert moles from step 3 to grams.

moles x molar mass = grams

0.150 mole O2 x (32.0 g O2/mole O2) = 4.80 g O2 produced from 12.25 g KClO3. This is the theoretical yield. If the ACTUAL yield is 4.20 grams, calculate percent yield. Percent yield = (actual yield/theoretical yield) x 100 = (4.20/4.80) x 100 = 87.5% yield

NOTE: In step 1, moles can be obtained other ways; in step 4 moles can be converted to other units.

a. For solutions, M x L = moles (or mL x M = millimoles).

b. For gases, L/22.4 = moles

4 0
3 years ago
What is the molarity of a 799 mL solution that contains 3.3 moles of NaNO3?
rusak2 [61]

Answer:   I think It might be 1 M???

Explanation:  Sorry I'm not in high school I put the wrong age

8 0
3 years ago
Other questions:
  • If I have 72 liters of argon gas held at a pressure of 3.4 atm and a temperature of 225k how many grams of argon do I have
    15·1 answer
  • The ph of a fruit juice is 3.2. find the hydronium ion​ concentration, left bracket upper h 3 upper o superscript plus right bra
    9·1 answer
  • g How many grams of beryllium are needed to produce "11.5" g of hydrogen gas?Be(s) + 2H 2 O(l) → Be(OH) 2 (aq) + H 2 (g)
    5·1 answer
  • All information on a line graph is as precise as the information in the data table. TrueFalse
    8·1 answer
  • Is food coloring dissolving in water a chemical change
    10·2 answers
  • Isra is analyzing the properties of several samples of elements to find out which sample is a metalloid. Which set of properties
    14·2 answers
  • Which of the following statements is true?
    7·2 answers
  • Hello it's my new id myself numu ​
    10·2 answers
  • 20 PIONTS PLZ HELP
    11·1 answer
  • Describe why the periodic table needed to be reordered in 1913.
    5·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!