4.2 understand how the pH scale, from 0–14, can be used to classify solutions as strongly acidic, weakly acidic, neutral, weakly alkaline or strongly alkaline

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  • Strongly acidic – pH 0-3
  • Weakly acidic – pH 4-6
  • NEUTRAL – pH 7
  • Weakly alkaline / base – pH 8-10
  • Strongly alkaline / base – pH 11- 14
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