"The circles contain numbers between zero and fourteen, like the pH scale. Evaluate the clues below to determine the pH or solution concentration represented, then shade in the circle containing that number. What does the secret message say?"Students need to know how to solve for pH, pOH, [OH-], and [H+]. Teacher can print out first slide on 8.5 x 11 paper or post to google classroom. Second slide has a color coded answer key.