As part of your digestive process, your stomach is flooded with some hydrochloric acid when you eat a cheeseburger (or any other food, for that matter).  There is some muscle action churning the food, and other chemicals added, but the hydrochloric acid is so strong that it can, over time, still do a pretty good job of breaking down food.

Wait, the formula for hydrochloric acid is HCl, which we would have called "hydrogen chloride".  How come it has another name?  Acids have common names.  One of the things that we will do today is see how to find the common names of acids.

This video shows how hydrochloric acid can change a cheeseburger over time.  If you were to put a cheeseburger into acetic acid (vinegar), it would not break down to the same extent, because hydrochloric acid is a much stronger acid.  Find out today how the strengths of acids and bases are measured, and how we can use indicators to help us determine if something is an acid or base, and how strong the acid or base is.

Things you should know after today:

  • what is the pH scale
  • what measurements on the pH scale correspond to acid, base and neutral
  • what does 1 unit on the pH scale mean?
  • how are H+ and OH- ion concentrations related to pH?
  • What are indicators
  • How can you use indicators to determine pH
  • How to find the common name for an acid


  • Notes


  • Workbook p84-85
  • Workbook p87-88
  • Worksheet
FileDescriptionFile size
Download this file (5.2. notes.pdf)5.2. notes.pdf 400 kB
Download this file (5.2.notes.v2015.pdf)5.2.notes.v2015.pdf 287 kB

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