Question

Which equation is matched with the correct equilibrium expression for that reaction?

Which equation is matched with the correct equilibrium expression for that reaction?

O₃(g) + O(g) → 2O₂(g), K _c = 2 × [O₂]/[O₃][O]

2CO(g) + O₂(g) → 2CO₂(g), K _c = [CO₂]/[CO][O₂]

2CO₂(g) → 2CO(g) + O₂(g) K _c = [CO₂]²/[CO]²[O₂]

N₂(g) + O₂(g) → 2NO(g), K _c = [NO]²/[N₂][O₂]

Calculate the pH for an aqueous solution of acetic acid that contains 5.15 × 10^-3 hydronium ion.

Calculate the pH for an aqueous solution of acetic acid that contains 5.15 × 10^-3 hydronium ion.

	2.29
	2.15 × 10-5 M
	11.71
	1.94 × 10-12 M

Answer 1

Equilibrium expression :

In this expression, equilibrium constant is equal to the ratio of product of concentration of products raised to the power equal the coefficient to the product of concentration raised to the power equal to the coefficient of each of the species.

In given reactions,

Only fourth reaction is matched with the equilibrium expression.

The reaction is :

N₂(g) + O₂(g) → 2NO(g), K _c = [NO]²/[N₂][O₂]

Question second :

We have to find pH of acetic acid solution, in it the concentration of H3O= 5.15 E-3 M

Lets use pH formula.

pH = - log [H3O+]

= - log ( 5.15 E-3 ) = 2.29

So the pH of the acetic acid solution would be 2.29