You need to prepare an acetate buffer of ph 5.92 from a 0.819 m acetic acid solution and a 2.56 m koh solution. if you have 775 ml of the acetic acid solution, how many milliliters of the koh solution do you need to add to make a buffer of ph 5.92? the pka of acetic acid is 4.76.

V KOH = 247.939 mL

Explanation:

at the point of equilibrium:

mol CH3COOH = mol KOHfor weak acid system - strong bases...(1)

⇒ mol CH3COOH = 0.775L * 0.819 mol / L

⇒ mol CH3COOH = 0.634 mol CH3COOH(2)

replacing (2) in (1):

0.634 mol = V KOH * 2.56 mol / L

⇒ V KOH = 0.634 mol / (2.56 mol / L )

⇒ V KOH = 0.247939 L ( 247.939 mL )

i just got this problem. it's 90.3

in chemistry, adhesion and cohesion are attractive forces that exist between molecules. they hold the molecules together from each other. they are different in that adhesive force exists between molecules of different substance while cohesive force happens between molecules of same substance.

adhesion between water and glass causes water molecules at the edge of water and glass interface to climb up the wall in a narrow glass tube. this is called capillary action. cohesion is what gives glass its shape and causes water to form a droplet.