Question

In a titration to determine the concentration of hydronium ions in a test solution, the test solution was titrated with a 0.250 mol/L sodium hydroxide solution. Calculate the molar concentration of the hydronium ion in the test solution.

a) 0.0456 mol/L

b) 0.556 mol/L

c) 0.0656 mol/L

d) 0.0625 mol/L

Answer 1

To determine the molar concentration of the hydronium ion in the test solution, use the balanced chemical equation of the titration reaction and stoichiometry.

Step-by-step explanation:

To determine the molar concentration of the hydronium ion in the test solution, we need to use the balanced chemical equation of the titration reaction and stoichiometry. The balanced equation for the reaction between hydronium ions (H3O+) and sodium hydroxide (NaOH) is:

H3O+ + OH- → 2H2O

In this reaction, one mole of H3O+ reacts with one mole of OH-. Therefore, the number of moles of H3O+ is equal to the number of moles of OH- in the titration of the test solution. The molar concentration of the hydronium ion in the test solution can be calculated using the volume and molarity of the sodium hydroxide solution:

Moles of H3O+ = Moles of OH- = (Volume of NaOH solution) x (Molarity of NaOH solution)

Using the given values, the molar concentration of the hydronium ion in the test solution is:

(0.250 mol/L) x (Volume of NaOH solution)