# The pH of earth’s water is con

The pH of earth’s water is controlled by the combination ofseveral equilibria found in water, as well as between water and theatmosphere. This problem considers a model for oceanic water. H2CO3+ CO3 yields 2HCO3 1) Calculate the equilibrium constant for thisequilibrium using Ka1 and Ka2 of carbonic acid. 3) Starting from apure solution of HCO3, how are the concentrations of H2CO3 and CO3related to each other? 4) Ocean water has an average pH of approx.8.1. How are the concentrations of H2CO3 and CO3 related to eachother in ocean water? 4) Do you think modeling ocean water as apure dilute bicarbonate ion solution a good model

1) the equilibrium will be between

H2CO3 + CO3-2 –>2HCO3

Equilibrium constant = K = [HCO3]^2 /[H2CO3][CO3-2]

The Ka1 and Ka2 for H2CO3 will be

H2CO3 –> H+   + HCO3-

Ka1 = [H+] [ HCO3-] /[H2CO3]

HCO3- –> H+ + CO3-2

Ka2 = [CO3-2][H+] / [HCO3]

so K =    Ka1 / Ka2

2) Question missing

3) HCO3- + H+ –> H2CO3 (1/Ka1)

1/Ka1 = [H2CO3] / [HCO3-] [H+]

Ka1 = [HCO3-] [H+] / [[H2CO3]

pKa1 = pHCO3- + pH – pH2CO3

pHCO3- = pKa1 – pH + pH2CO3……(1)

HCO3- —> H+ +CO3-2     (Ka2)

Ka2 = [H+]'[CO3-2] / [HCO3-]

pKa2 = pH’ + pCO3-2 – pHCO3-

pHCO3- = pH’ + pCO3-2 -pKa2 … …(2)

So we can equate (1) and (2)

pKa1 – pH + pH2CO3 = pH’ +pCO3-2 -pKa2

So (CO3-2) = {(2Ka)/[H+]} X[HCO3]

4) Average pH = 8.1

H2CO3 –> H+ + HCO3-

HCO3- –> H+ + CO3-2

[H+] = -antilog 8.1 = 7.94 X 10^-9

So if we know the concentratio of any species we can calcualteconcentration of CO3-2 accrodingly

4) yes the modelling water is a good model

##### "Our Prices Start at \$11.99. As Our First Client, Use Coupon Code GET15 to claim 15% Discount This Month!!"
Calculate the price
Pages (550 words)
\$0.00
*Price with a welcome 15% discount applied.
Pro tip: If you want to save more money and pay the lowest price, you need to set a more extended deadline.
We know how difficult it is to be a student these days. That's why our prices are one of the most affordable on the market, and there are no hidden fees.

Instead, we offer bonuses, discounts, and free services to make your experience outstanding.
How it works
Receive a 100% original paper that will pass Turnitin from a top essay writing service
step 1
Fill out the order form and provide paper details. You can even attach screenshots or add additional instructions later. If something is not clear or missing, the writer will contact you for clarification.
Pro service tips
How to get the most out of your experience with brilliantassignmenthelp.com
One writer throughout the entire course
If you like the writer, you can hire them again. Just copy & paste their ID on the order form ("Preferred Writer's ID" field). This way, your vocabulary will be uniform, and the writer will be aware of your needs.
The same paper from different writers
You can order essay or any other work from two different writers to choose the best one or give another version to a friend. This can be done through the add-on "Same paper from another writer."
Copy of sources used by the writer
Our college essay writers work with ScienceDirect and other databases. They can send you articles or materials used in PDF or through screenshots. Just tick the "Copy of sources" field on the order form.
Testimonials
See why 20k+ students have chosen us as their sole writing assistance provider
Check out the latest reviews and opinions submitted by real customers worldwide and make an informed decision.
11,595
Customer reviews in total
96%
Current satisfaction rate
3 pages
Average paper length
37%
Customers referred by a friend
Use a coupon FIRST15 and enjoy expert help with any task at the most affordable price.
Claim my 15% OFF Order in Chat