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Sulphur dioxide is more effective against wine spoilage organisms at

  • A.Lower pH
  • B.Higher pH, closer to neutrality
  • C.Higher temperature above thirty degrees
  • D.Higher alcohol concentrations only

Answer: A

The active molecular form predominates at low pH, so the same total addition is far more effective in a high-acid wine than in a low-acid one. This is why winemakers adjust the dose according to the pH of the wine rather than using a fixed rate.

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