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).
Since both acids and bases dissolve in water to form ions, they are both electrolytes. However, most acids and bases do not completely dissociate to form ions, those that do are called strong acids or strong bases. 1  Strong acid/base Completely ionizes in solution. 2  Strong acid/base Strong electrolyte.3  Weak acid/base Partially ionizes in solution. 4  Weak acid/base Weak electrolyte.owever, most acids and bases do not completely dissociate to form ions, those that do are called strong acids or strong bases. 1  Strong acid/base Completely ionizes in solution. 2  Strong acid/base Strong electrolyte. 3  Weak acid/base Partially ionizes in solution.