Which of the following aqueous solutions are good buffer systems? . 0.32 M calcium chloride + 0.27 M sodium chloride 0.35 M ammonia + 0.36 M calcium hydroxide 0.19 M barium hydroxide + 0.28 M barium chloride 0.12 M hydrofluoric acid + 0.17 M potassium fluoride 0.20 M hydrobromic acid + 0.22 M sodium bromide

0.12 M hydrofluoric acid + 0.17 M potassium fluoride

Explanation:

To make a buffer, you must to have an aqueous mixture of a weak acid and its conjugate base or vice versa.

Knowing that:

0.32 M calcium chloride + 0.27 M sodium chloride: is not a good buffer system because CaCl₂ and NaCl are both salts.

0.35 M ammonia + 0.36 M calcium hydroxide is not a good buffer system because ammonia is a weak base but calcium hydroxide is a strong base

0.19 M barium hydroxide + 0.28 M barium chloride is not a good buffer system because Ba(OH)₂ is a strong base.

0.12 M hydrofluoric acid + 0.17 M potassium fluoride is a good buffer system because HF is a weak acid and KF (F⁻ in aqueous medium), is its conjugate base

0.20 M hydrobromic acid + 0.22 M sodium bromide is not a good buffer system because HBr is a strong acid.

each  column  of the  table  is called a group. elements in a group share similar properties. groups are  read  from  top  to  bottom. metal. metalloid. nonmetal. solid. liquid. gas. fe. hg. o.  2. 3. 4. 5. 6. 7. 8. 9.  2. beryllium. 9.012. 4.  sodium. 22.990.  11. 3.  magnesium. 24.305.  12.  potassium. 39.098.  19. 4.  calcium. 40.078.  20. i guess  i