NaOH Concentration Determination by Titration

Flashcards about the procedure to determine NaOH concentration.

Goal of the Practicum

Determination of the concentration of sodium hydroxide by titration with a standardized 0.10 mol/L HCl solution.

Skills Acquired

To learn how to use volumetric equipment: volumetric flask, pipette, pipette pump, burette.

Research Problem

Determine the concentration of sodium hydroxide by titrating with a standardized 0.10 mol/L HCl solution.

Information Gathering

Principle of titration and acid-base indicators.

Materials

Burette, stand, burette clamp, 250 mL Erlenmeyer flask, 100 mL graduated cylinder, 10 mL pipette, funnel, white card.

Reagents

Phenolphthalein, distilled water, NaOH solution, HCl solution 0.10 mol/L.

Step 1 of Procedure

Pipette 10 mL of NaOH solution into an Erlenmeyer flask, add a few drops of phenolphthalein, and homogenize.

Step 2 of Procedure

Fill the burette with the 0.10 mol/L HCl solution.

Step 4 of Procedure

Titrate until colorless.

Step 6 of Procedure

Perform the titration at least three times and calculate the average volume added.

Step 7 of Procedure

Rinse the burette with tap water.

Calculation 1

Calculate the concentration of NaOH in mol/L.

Calculation 2

Calculate the concentration of NaOH in m/V%.