pH Scale

Lab type: 
Virtual lab
Lab owner: 
Archie Paulson,
Chris Malley,
Jack Barbera,
Kathy Perkins,
Laurie Langdon,
Patricia Loeblein,
PhET Interactive Simulations,
Wendy Adams
Contact person: 
PhET Interactive Simulations
Age range: 
12-14, 14-16, 16-18, >18
English, German, French, Italian, Spanish, Polish, Dutch, Hungarian, Portuguese, Greek, Swedish, Czech, Bulgarian, Slovak, Danish, Finnish, Slovene, Estonian, Croatian, Latvian, Russian, Arabic, Turkish, Chinese, Hindi, Bosnian, Serbian
Level of difficulty: 
Level of interaction: 
Booking required: 
Lab description and primary aims of the lab: 

Test the pH of things like coffee, spit, and soap to determine whether each is acidic, basic, or neutral. Visualize the relative number of hydroxide ions and hydronium ions in solution. Switch between logarithmic and linear scales. Investigate whether changing the volume or diluting with water affects the pH. Or you can design your own liquid. The primary aims of the lab are the following:

  • 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
Technical requirements: 

HTML5-Browser (IE9+,Firefox,Chrome,etc.)

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