Logarithmic scale: pH scale

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  1. Pure water has a pH of 7. Vinegar has a pH of 3.
    Complete the following 2 sentences:
    (i) Pure water is __________ times as alkaline as vinegar.
    (ii) Vinegar is __________ times as acidic as pure water.
    1. Lemon juice has a pH of 2.5.
      Stomach acid is 8 times more acidic than lemon juice.
      Tomato juice is 90 times more basic than lemon juice
      Find the pH of:
      stomach acid
      (ii) tomato juice