sentence: Some acids are strong and others are weak.
sentences_before: A chemical can donate a proton if the hydrogen atom is attached to an electronegative atom like oxygen, nitrogen, or chlorine.
sentences_after: The weak acids hold on to some of their protons, while the strong acids let go of all of them. Weak acids generally have  a pH value of 4-6 while strong acids have a pH value of 1 to 3.
concept_name: acid
headings: Acid
categories: Basic English 850 words