Hi Gretchen, I believe it does take 21 days to change or create a habit although I think the statement should be rephrased to say it takes approximately 21 days of consistent daily behaviour combined with belief, faith, determination and emotional leverage or sincere desire to succeed to form new habits.
An example of a strong acid is hydrochloric acid. A strong acid has a pH of 1. hydrogen chloride (in water) hydrogen ion + chloride ion HCl(aq) H+(aq) + Cl-(aq). All of the hydrogen chloride molecules become hydrogen ions and chloride ions when they are dissolved in water (see examples of other strong acids).
exists and is an alternate of . An acid is a substance which releases H+ ions when dissolved in water (i.e when in aqueous state). Vinegar is a an acid, with a pH of about 2. On the other hand, ammonia is a weak base, with a pH of about 9. 2 people found this useful.