Strong Acids - pH of HCl


Concentrated solutions of HCl are corrosive and toxic

Chemicals and Solutions: 

0.1 M HCl

Methyl orange indicator solution


5 cylinders

100 ml graduated cylinder, 10 ml grad. cylinder

Buffer array of methyl orange indicator

stir rods

pH meter and digital display


Mark cylinders as follows: 0.1 M, 0.01 M, 10-3 M, 10-4 M, 10-5 M Hydrochloric acid.

Fill the first cylinder (marked 0.1 M) with 100 ml of 0.1 M HCl.

Measure 10 ml of 0.1 M HCl into 100 ml cylinder, dilute to 100 ml with distilled water.

Repeat the above step, making a serial dilution, until all the concentrations have been made.

Add methyl orange indicator to each concentration and compare color to the buffer array.  Use the pH meter-digital display to take the pH of each concentration.


This demonstration can be used in conjunction with demonstration # 58 Weak acids: pH of acetic acid

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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