# chemistry

posted by .

calculate the pH of a 1.94M solution of nitrous acid (HNO2 - ka = 4.5E-4).

• chemistry -

Set up an ICE chart, something like the following:
............HNO2 ==> H^+ + NO2^-
initial....1.94M.....0.......0
change......-x.......+x.......+x
final......1.94-x.....x........x

Ka = (H^+)(NO2^-)/(HNO2)
Substitute from the ICE chart to the Ka expression, solve for x and convert to pH.

• chemistry -

for .148M it is 2.00

## Similar Questions

1. ### Chemistry

Buffers- Common Ion effect IS this Correct Calculate the pH of a aqueous solution containing 0.15 M HNO2 and 0.20 M NaNO2 (aq). The Ka of nitrous acid is 4.0*10^-4. HNO2 + H20 <--> NaNO2- + H30^+ Inital 0.15 0.20 X Final 0.15 …
2. ### chemistry

Nitrous acid, HNO2, has a Ka of 7.1 x 10^-4. what are [H3O+], [NO2-], and [OH-] in .920 M HNO2?
3. ### chemistry

If the system below is at equilibrium in a closed vessel and a small amount of nitrous acid [HNO2(§¤)] is added, what would be expected to happen?
4. ### Chemistry

The Ka value of nitrous acid, HNO2 , is 4.0 × 10¯4 . What is the equilibrium constant for the reaction; NO2¯ + H2O <-> HNO2 + OH¯ ?
5. ### Chemistry

The Ka value of nitrous acid, HNO2 , is 4.0 × 10¯4 . What is the equilibrium constant for the reaction; NO2¯ + H2O <-> HNO2 + OH¯ ?
6. ### Chemistry

At 298 K, nitrous acid (HNO2) dissociates in water with a Ka of 0.00071. a)Calculate G° for the dissociation of HNO2. (Use Ka to calculate the answer.) b) Calculate G if [H3O+] = 0.00070 M, [NO2 - ] = 0.16 M, and [HNO2 ] = 0.21 M.
7. ### Chemistry

Calculate the percent ionization of nitrous acid in a solution that is 0.311 M in nitrous acid (HNO2) and 0.189 M in potassium nitrite (KNO2). The acid dissociation constant of nitrous acid is 4.50 × 10-4.
8. ### Chemistry 30

How do I complete an ICE table for a solution of nitrous acid, HNO2, one of the acids associated with acid deposition?
9. ### Chemistry

Calculate the concentration of H+ ions of an aqueous solution of nitrous acid ( HNO2) to 0.02 mol/L knowing that the degree of ionization of acid is 3%
10. ### Chemistry

Determine the concentration of H + ions from an aqueous solution of nitrous acid (HNO2) 0.02 mol / L, knowing the degree of ionization of the acid is 3%

More Similar Questions