pH is the measurement of the amount of hydrogen ions in solution. Litmus paper can be used to measure pH. A base will cause red litmus to turn blue; blue litmus will not change. An acid will cause blue litmus to turn red; red litmus will not change. A neutral solution will not change red or blue litmus.

Use the litmus paper below to test each of the seven solutions. Drag a strip to a beaker and dip it in the solution. Release the strip for a couple of seconds. Then lift the strip out of the beaker and record its color in the table in your Lab-Lecture Manual on page 29. Also write the name of each solution in the box with its number, and your conclusion about the solution's pH.