# chemistry

posted by .

Write the equation for the dissociation of carbonic acid.

• chemistry -

Well:

pKa = -log Ka, and

Ka = [H+][A-] / [HA]

Therefore Ka = [H+][HCO3-] / [H2CO3]

[H+] = Ka . [H2CO3] / [HCO3-]

does this help?

• chemistry -

not really I am just trying to understand what the chemical equation looks like

• chemistry -

H2CO3 + H2O <---> HCO3− + H3O+

carbonic acid is going to be 1M (mol dm-3) 20 ml

How much water in ml should I have to full dissociate 20 ml of 1M carbonic acid? To determine pKa... i was going to find the pH of the solution after it has been dissciated (carbnoic acid is a weak acid, will not fully dissociate).
from the pH... i will find the [H+] and then plug in the formula
Ka = [HCO3−] x [H3O+] / [H2CO3]

This is my last resort i don't have any thing else but done this help at all?

• chemistry -

The dissociation of H2CO3 occurs in two steps.
H2CO3 + H2O ==> H3O^+ + HCO3^-
HCO3^- + H2O ==> H3O^+ + CO3^2-

## Similar Questions

1. ### chemistry

I need an equation for the neutralization of lemon juice (citric acid) with baking soda (sodium hydrogen or sodium bicarbonate) that shows a proton transfer to form carbonic acid and a salt..And an equation for the decomposition of …
2. ### chemistry

A 0.942 M sample of carbonic acid, H2CO3, has a measured hydronium ion concentration of 6.36 ´ 10–4 M. Calculate the acid-ionization constant of carbonic acid. The equilibrium equation is: H2CO3(aq) + H2O(l) <--><--> …
3. ### chemistry (acid-ionization constant)

A 0.942 M sample of carbonic acid, H2CO3, has a measured hydronium ion concentration of 6.36 ´ 10–4 M. Calculate the acid-ionization constant of carbonic acid. The equilibrium equation is: H2CO3(aq) + H2O(l) <--><--> …
4. ### Chemistry

Carbon dioxide dissolves in water to form carbonic acid, which is primarily dissolved CO2. Dissolved CO2 satisfies the equilibrium equation. The acid dissociation constants listed in most standard reference texts for carbonic acid …
5. ### chemistry

Carbonic acid, H2CO3, decomposes into water and a gas. Write the molecular equation for this decomposition. Remember to include the states of the reactants and products. Carbonic acid is an aqueous solution.
6. ### Chemistry

Carbon dioxide dissolves in water to form carbonic acid, which is primarily dissolved CO2. Dissolved CO2 satisfies the equilibrium equation: CO2 (g) <----> CO2 (aq) K=0.032 The acid dissociation constants listed in most standard …
7. ### Analytical Chemistry

Carbon dioxide dissolves in water to form carbonic acid, which is primarily dissolved CO2. Dissolved CO2 satisfies the equilibrium equation. CO2(g) <----> CO2(aq) The acid dissociation constants listed in most standard reference …
8. ### chemistry

Carbon dioxide dissolves in water to form carbonic acid, which is primarily dissolved CO2. Dissolved CO2 satisfies the equilibrium equation: CO2(g)<==> CO2 (aq) K=0.032 The acid dissociation constants listed in most standard …
9. ### Chemistry

Carbon dioxide dissolves in water to form carbonic acid, which is primarily dissolved CO2. Dissolved CO2 satisfies the equilibrium equation CO2(g) <-> CO2(aq) K=0.032 The acid dissociation constants listed in most standard reference …
10. ### Chemistry

Carbon dioxide dissolves in water to form carbonic acid, which is primarily dissolved CO2. Dissolved CO2 satisfies the equilibrium equation CO2(g) <-=> CO2(aq) K=.032 The acid dissociation constants listed in most standard reference …

More Similar Questions