Question

The flask contains 10.0 mL of HCl and a few drops of phenolphthalein indicator. The buret contains 0.130 M NaOH It requires 32.4 mL of the NaOH solution to reach the end point of the titration.

Answer 1

To find the concentration of the original hydrochloric acid solution sample, a titration with NaOH solution can be performed. The balanced chemical equation and stoichiometry can be used to calculate the concentration of HCl.

Step-by-step explanation:

To find the concentration of the original hydrochloric acid solution sample, we can use the concept of titration. Titration is a technique used to determine the concentration of an unknown solution by reacting it with a known solution of a reactant. In this case, the HCl solution is titrated with NaOH solution.

We are given the following information:

• Volume of NaOH solution added: 31.416 mL
• Concentration of NaOH solution: 0.1234 M

To calculate the concentration of HCl, we can set up a balanced chemical equation:

HCl(aq) + NaOH(aq) → NaCl(aq) + H2O(l)

Using the stoichiometry of the reaction, we can determine the moles of NaOH used, which is equal to the moles of HCl in the original sample:

Moles of HCl = Moles of NaOH

We can then calculate the concentration of the HCl solution:

Concentration of HCl = Moles of HCl / Volume of HCl solution

Substituting the known values into the equation, we can solve for the concentration of HCl.