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Weak Acids - Tritration of Acetic Acid


Chemicals and Solutions: 

0.1 M Acetic acid

Methyl orange indicator solution, dropper bottle


5 hydrometer cylinders

10 mL grad. cylinder

100 ml graduated cylinder

pH meter and digital display

buffer array of methyl orange indicator

stir rods


Mark both sets of cylinders as follows:

10-1M, 10-2M, 10-3 M, 10-4 M, 10-5 M. Be sure to mark both sets of cylinders in this manner.

Add methyl orange indicator to each concentration of acetic acid and compare the color to the buffer array.

Use the pH meter-digital display to take the pH of each concentration.


*Note* This demonstration can be used in conjunction with demonstration


Discussion:  Acetic acid solutions with the following concentrations have the pH indicated.

0.1 M acetic acid = pH 2.87

0.01 M acetic acid = pH 3.37

0.001 M acetic acid = pH 3.8

0.0001 M acetic acid = pH 4.3

0.00001 M acetic acid = pH

Vinegar is ~5% acetic acid solution which is ~0.9 M which is ~pH 2.4






To schedule a demonstration, please send an email to the demonstration lab.



Eric Camp

Lecture Demonstration Technician

Bagley Hall 171

(206) 543-1606


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