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
defon
3 years ago
7

Calculate the concentration of all species in a 0.165 m solution of h2co3.

Chemistry
1 answer:
xxMikexx [17]3 years ago
3 0

(1) H2CO3 + H2O --> HCO3- + H3O+ [Ka = 4.5E-7]  

(2) HCO3- + H2O --> CO32- + H3O+ [Ka = 4.7E-11]  

Observe that the two Ka values differ from each other drastically. This will mean that in terms of pH, ONLY THE FIRST IONIZATION WILL AFFECT pH.  

(1) H2CO3 + H2O --> HCO3- + H3O+ [Ka = 4.5E-7]  

I.....0.165M..................0..........  

C......-x......................+x........  

E....0.165-x.................x...........  

4.5E-7 = x^2/(0.165-x) <-- use the appoximation rule because Ka is very small  

2.72E-4 = x  

Thus, from equation (1), we see that the [H3O+] = 2.72E-4M, [H2CO3] = 0.165M, and [HCO3-]= 2.72E-4M. Note that THIS step will determine the pH of the polyprotic acid  

To calculate the last species, just transfer these values the next equation  

(2) HCO3- + H2O --> CO32- + H3O+ [Ka = 4.7E-11]  

I....2.72E-4..................0..........  

C  

E  

4.7E-11 = (x*2.72E-4)/2.72E-4  

4.7E-11 = x = [CO32-]  

To calculate the OH- from H3O+, just find the pH of H3O+, subtract it from 14 to find the pOH, and find the [OH-] from that.  


You might be interested in
Statement 1: The reaction follows the mass energy equation E= mc". Statement 2: A large amount of energy is produced during the
pogonyaev

Answer:

d

Explanation:

Chem teacher

4 0
3 years ago
A science teacher asked students to calculate the density of a toy block. The mass of the block was 110 grams and the volume of
Kipish [7]

Answer:

13.75

Explanation:

Density is equal to mass divided by volume. 110/8 = 13.75

5 0
3 years ago
When 1 mol of sodium nitrate, is dissolved in 1 cubic decimeter of water, 40 kJ of heat energy is absorbed. What is the drop in
vesna_86 [32]

Answer:

 1.0  ° C

Explanation:

The molar mass for Sodium Nitrate NaNO₃ = (23+14+(16×3)) = 85

Number of moles of NaNO₃  = mass of NaNO₃ /molar mass of NaNO₃

⇒ 17/85 = 1.38 moles

Since 1 mole of NaNO₃  dissolved in 1 cubic decimeter of water, 40 kJ of heat energy is absorbed.

when 1.38 mole of NaNO₃  dissolved in 1 cubic decimeter of water, x kJ of heat energy is absorbed..

Then; x kJ of 1.38 mole of NaNo₃ = 1.38 × 40 kJ  =55.2 kJ of heat absorbed.

Using the relation : Q = mcΔT  to determine the temperature drop ; we get:

55.2 = 17 × 4 (ΔT)

55.2  = 68 ΔT

ΔT= 0.8 ° C

ΔT ≅  1.0  ° C

Therefore, the drop in temperature when 17.0g of sodium nitrate is dissolved in 1 cubic decimeter of water is   1.0  ° C

7 0
3 years ago
Create a graphic representation that illustrates the steps from gene to protein. Label and describe each step.
Vesna [10]

Okay so,

1) Translation- show the RNA strand attatching to a DNA strand with the complimentary base pairs. introns are spliced

2) mRNA leaves the cell and joins with a ribosome

3) Transcription - tRNA (clover shaped) reads each codon (triplets) which each code for an amino acid. The stop codons on the end tell the tRNA that the chain is finished

4) the sequence forms the primary structure (all peptide bonds) which determines the shape of the secondary (hyrdogen and peptide) and hence determines the shape of the tertiary structure of a protein (ionic, hydrogen, disulfide bridges and hydrophibic interactions)


Hope this helps :)

6 0
3 years ago
What is the correct name for FeCI3?
aliya0001 [1]

Answer:

Iron(III) chloride

Explanation:

4 0
3 years ago
Read 2 more answers
Other questions:
  • Draw the molecules for the following reaction:
    14·1 answer
  • What two waste products the body must eliminate?
    5·1 answer
  • Calculate the molarity of 0.700 mol of na2s in 1.05 l of solution.
    14·1 answer
  • Under which conditions of temperature and pressure does a real gas behave most like an ideal gas
    11·1 answer
  • What is true of greenhouse gases​
    15·1 answer
  • A 4.5x10 to the negative 3 M solution of a weak acid is 6.3% dissociated at 25%C. In a 4.5x10 to the negative 4 M solution, the
    13·1 answer
  • What type of electric cell would be best in a flashlight or smoke detector? Explain each choice
    6·2 answers
  • What is the molar mass of Ca(OH)2
    7·2 answers
  • What is the wavelength of an X-ray that has a frequency of 7.8 x 1017 Hz
    8·1 answer
  • __________ is required to make a wave.
    5·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!