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Chemistry — Acid–Base Indicators

Colour changes of common indicators.

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digraph Indicators {
  rankdir=LR;
  node [shape=box, style=rounded];
  Litmus -> "Red (acid) / Blue (alkali)";
  Phenolphthalein -> "Colourless (acid) / Pink (alkali)";
  "Methyl orange" -> "Red (acid) / Yellow (alkali)";
  "Universal indicator" -> "Full pH 1-14 range";
}