pH scale basics simulation


Explore the basics of pH using this simulation. Add a variety of common solutions, modify the concentration and see the effects on pH.

Type of Activity

group work, working independently



Age Group

11 to 16 years


This resource has been provided by, or developed in partnership with, PhET Interactive Simulations, University of Colorado Boulder

pH scale basics simulation, developed by PhET, University of Colorado Boulder. Click the PhET logo in the resource for more information.


PhET sims are fun, interactive, research-based simulations of physical phenomena developed by the PhET™ project at the University of Colorado. Conversion to HTML5 and tablet compatibility supported by the Royal Society of Chemistry.

Sample Learning Goals:

  • Determine if a solution is acidic or basic.
  • Place acids or bases in relative order.
  • Describe on a molecular scale, with illustrations, how the water equilibrium varies with pH.
  • Determine concentration of hydroxide, hydronium and water at a given pH.
  • Relate liquid color to pH.
  • Predict (qualitatively and quantitatively) how dilution and volume will effect the pH and concentration of hydroxide, hydronium and water.