pH indicators

pH indicators
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  • Hey everybody! Today we will be learning about Acids and Bases. Who knows what an indicator is? 
  • An indicator is   is any substance that gives a visible sign, usually by a colour change, of the presence of a acid or a base. 
  • An acid is   a molecule or other entity that can donate a proton or accept an electron pair in reactions. Acids are sour to taste and can be corrosive. The ion released by an acid is hydrogen ions
  • Very good Kayla!   Now, can anyone tell me what an acid and a base is?
  • And bases are substances that, in aqueous solution, release hydroxide ions. They are slippery to the touch and can taste bitter.
  • Wow! You guys are amazing!   Does anyone know how pH indicators work? 
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  • A pH indicator is a compound that changes colour over a range of pH values. When in contact with an acid or a base, the colour will change accordingly to indicate if the substance is acidic or basic. 
  • Lets take a note!
  • Ex. Litmus paper is  a solution of different dyes  made from lichen. This paper can give a rough indication of the pH value of a  substance. Blue litmus paper will turn red in an acid and red  litmus paper will turn blue when bases are present . 
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