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%

To determine the concentration of H+ ions from an aqueous solution of nitrous acid (HNO2) with a known degree of ionization, you can follow these steps:

Step 1: Write the balanced equation for the ionization of nitrous acid:
HNO2 ⇌ H+ + NO2-

Step 2: Determine the initial concentration of nitrous acid (HNO2). In this case, it is given as 0.02 mol/L.

Step 3: Calculate the degree of ionization (α). The degree of ionization is defined as the ratio of the concentration of the ionized species (H+) to the initial concentration of the acid (HNO2). In this case, the degree of ionization is given as 3%, which can be expressed as 0.03 (since percentages are decimals). So, α = 0.03.

Step 4: Calculate the concentration of H+ ions. Since the stoichiometric coefficient of H+ in the balanced equation is 1, the concentration of H+ ions is equal to the degree of ionization (α) multiplied by the initial concentration of the acid (HNO2).

Concentration of H+ ions = α * [HNO2]
= 0.03 * 0.02 mol/L
= 0.0006 mol/L

Therefore, the concentration of H+ ions in the aqueous solution of nitrous acid is 0.0006 mol/L.

To determine the concentration of H+ ions from an aqueous solution of nitrous acid (HNO2), we need to use the degree of ionization of the acid.

The degree of ionization (α) is given as 3%, which can be written as 0.03.

Nitrous acid (HNO2) ionizes into H+ and NO2- ions by the equation:

HNO2 ⇌ H+ + NO2-

From the equation, we can see that for every 1 mole of nitrous acid that ionizes, we will have 1 mole of H+ ions.

Given that the initial concentration of nitrous acid is 0.02 mol/L, and the degree of ionization is 0.03, we can calculate the concentration of H+ ions.

Step 1: Calculate the moles of HNO2 that ionize.
Moles of HNO2 ionized = Degree of ionization × Initial concentration of HNO2
Moles of HNO2 ionized = 0.03 × 0.02 mol/L
Moles of HNO2 ionized = 0.0006 mol

Step 2: Calculate the concentration of H+ ions.
Since the moles of HNO2 ionized is equal to the moles of H+ ions, the concentration of H+ ions will also be 0.0006 mol/L.

Therefore, the concentration of H+ ions from the aqueous solution of nitrous acid (HNO2) is 0.0006 mol/L.