NaOH Concentration Determination via Titration

Flashcards for reviewing a chemistry experiment on determining NaOH concentration via titration.

What are the goals of this experiment?

To determine the concentration of sodium hydroxide (NaOH) by titration with a standardized hydrochloric acid (HCl) solution (0.10 mol/L). Also, to learn how to use volumetric lab equipment.

What method is used to determine the concentration of NaOH?

Titration with a standardized HCl solution (0.10 mol/L).

What materials are needed for this experiment?

Buret, stand, buret clamp, 250 mL Erlenmeyer flask, 100 mL graduated cylinder, 10 mL pipette, funnel, white card. Chemicals include phenolphthalein, distilled water, NaOH solution, and 0.10 mol/L HCl solution.

Describe the experimental procedure.

Use a pipette to transfer 10 mL of NaOH solution into an Erlenmeyer flask, add a few drops of phenolphthalein, and mix. Fill the buret with 0.10 mol/L HCl solution, record the initial volume, titrate until colorless, and record the final volume. Repeat the titration three times and calculate the average volume of HCl added.

What calculations are performed after the titration?

Calculate the concentration of NaOH in mol/L and m/V%.

What is the evaluation step in the experiment?

Compare the calculated concentration with the value on the label and identify possible sources of error if they differ.

What is phenolphthalein?

A chemical indicator used in titrations, which changes color to indicate the endpoint.