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 weak acid is ethanoic acid. A weak acid has a pH of 3 to 5. ethanoic acid (in water) hydrogen ion + ethanoic ion CH3CO2H(aq) H+(aq) + CH3CO2-(aq) Some of the ethanoic acid molecules become ions in water but most of them stay as molecules. The reaction is reversible (shown by the arrow).
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.