Logarithmic scale: pH scale

Lessons

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.
   
2. 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:
   (i)
   stomach acid
   (ii) tomato juice