pH Lab

Today you will be examining the following acids:

Vinegar, Sprite, Stomach Acid, Battery Acid, Coke

• Each acid should be written on the top of it’s own page in your lab notebook with all of the data, calculations, equations, and pictures NEATLY organized!!!!!!! If I have to decipher it, I am not grading it!

• Data/Information for each acid:

  • Measure the pH of the substance.

  • Use the pH to calculate the hydrogen ion concentration, hydroxide ion concentration, and pOH. Be sure to include units when necessary.

  • Identify the chemical formula and name for the main acid in the substance. Use the internet and/or the label to assist you.

  • Write the ionization equation for the acid in water. Write the equations twice, once including water (with H3O+) and once not including water (with H+).

  • Draw a picture to represent what is present in the solution. Include water in your picture.

  • Look up the ka values for each acid. Remember strong acids do not have a ka value since they completely ionize.

• When you are all done:

  • make a list of all your strong acids

  • make a list of all your weak acids (with ka values), put them in order of strongest to weakest.