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pH Scale

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PhET Interactive Simulations
University of Colorado Boulder


  • pH
  • Dilution
  • Concentration
  • Acids
  • Bases


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!

Sample Learning Goals

  • Determine if a liquid is acidic, basic, or neutral
  • 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 affect the pH and concentration of hydroxide, hydronium and water
Version 1.2.12
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Basque All Basque Run now pH eskala  
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Bulgarian All български Run now Скала pH  
Chinese (Simplified) All 中文 (中国) Run now PH值  
Chinese (Traditional) All 中文 (台灣) Run now pH Scale_酸鹼性  
Croatian All hrvatski Run now pH skala  
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Georgian All Georgian Run now pH სკალა  
German All Deutsch Run now pH Skala  
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Hindi All हिंदी Run now pH माप   
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Indonesian All Bahasa Indonesia Run now Skala pH  
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Persian All فارسی Run now pH مقیاس  
Polish All polski Run now Skala pH  
Portuguese All português Run now Escala de pH  
Portuguese (Brazil) All português (Brasil) Run now Escala de pH  
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Serbian All Српски Run now pH СКАЛА  
Sinhalese All Sinhalese Run now pH පරිමාණය  
Slovak All Slovenčina Run now pH škála  
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Spanish All español Run now Escala de pH  
Spanish (Mexico) All español (México) Run now Escala de pH  
Spanish (Peru) All español (Perú) Run now Escala de pH  
Spanish (Spain) All español (España) Run now Escala de pH  
Swahili All Swahili Run now pH Scale  
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Turkish All Türkçe Run now pH Ölçeği  
Turkmen All Turkmen Run now pH şkala  
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