Presentation is loading. Please wait.

Presentation is loading. Please wait.

Titration Pre-lab.

Similar presentations

Presentation on theme: "Titration Pre-lab."— Presentation transcript:

1 Titration Pre-lab

2 What is titration? Method to determine the concentration of one solution based on its rxn with a known solution (titration standard) It determines the unknown molarity of a given solution

3 The Process You have the following
50 ml Unknown solution (acid or base) Known solution (acid or base) If you have an unknown acid you will need the known base and vice versa An indicator (phenolphthalein or methyl orange) to show a change in pH

4 The process The lab process:
Pour 1/3 of the unknown (~16.7 ml) into the Erlenmeyer flask. Be sure to record the exact amount in your data table If you have an unknown acid put the flask underneath the base buret.

5 The Process Add 3 drops of indicator
Phenolphthalein is colorless in acids and pink in bases at about a pH 8.2 Methyl orange is red in acids and turns yellow at about 4.4

6 The Process Check your buret of the standard you are using. Be sure it is the opposite of the unknown, and that it is reasonably full. Be sure there are no air bubbles in the tip Take the initial reading of the buret and record it. Read to the nearest 100th of a ml



9 The Process Have 1 person constantly swirling the flask
The other person should slowly add small amounts of standard solution When the unknown solution appears to be close to changing colors slow down and add 1 drop at a time until the color stays (end point)

10 The Process If the color of the end point is a deep color you added too much. The end point should be a light, barely a change in color. Record the final buret reading and the color in the data table

11 The Process Rinse the flask with tap water thoroughly and repeat this 2 more times. Thoroughly clean and dry all equipment. Leave unused standard solution in the burets

12 The Calculations Calculate the molarity for each trial using M1V1 = M2V2 M1 = molarity of acid V1 = volume of acid M2 = molarity of base V2 = volume of base Find the average of the 3 trials


Download ppt "Titration Pre-lab."

Similar presentations

Ads by Google