Chemists define the acidity or alkalinity of a substance according to the formula pH = –log[H+] where [H+] is the hydrogen ion concentration, measured in moles per liter. Solutions with a pH value of less than 7 are acidic; solutions with a pH value of greater than 7 are basic; solutions with a pH of 7 (such as pure water) are neutral.
a) Suppose that you test apple juice and find that the hydrogen ion concentration is [H+] = 0.0008. Find the pH value and determine whether the juice is basic or acidic.

Question

Chemists define the acidity or alkalinity of a substance according to the formula pH = –log[H+] where [H+] is the hydrogen ion concentration, measured in moles per liter. Solutions with a pH value of less than 7 are acidic; solutions with a pH value of greater than 7 are basic; solutions with a pH of 7 (such as pure water) are neutral. 
a) Suppose that you test apple juice and find that the hydrogen ion concentration is [H+] = 0.0008. Find the pH value and determine whether the juice is basic or acidic.

anonymous · Answer

b) You test some ammonia and determine the hydrogen ion concentration to be [H+]= 1.7 × 10–8. Find the pH value and determine whether the ammonia is basic or acidic.