A weak acid dissociates in pure water according to the equilibrium
HACAU + H200 H30+20 + A 9
1. The weak acid, HA, has an acid dissociation constant, Ka=7.2999999999999998x107, is added to
water at a concentration of 0.51000000000000001M. (construct an ICE chart to assist)

a. What is the H30+ concentration in solution?
HAW + H201) + H30+4 + Acam

b. Describe how and why the addition of highly concentrated (not affecting solution volume) HCI
will affect the A- concentration. Justify your answer.

Drug abuse will not lead to physical and psychological dependence. true or false ?

Answer asap need by wednesday morning explain how a buffer works, using an ethanoic acid/sodium ethanoate system including how the system resists changes in ph upon addition of a small amount of base and upon addition of a small amount of acid respectively. include the following calculations in your i. calculate the ph of a solution made by mixing 25cm3 0.1m ch3cooh and 40cm3 0.1m ch3coo-na+. [ka = 1.74 x 10-5 m] ii. calculate the ph following the addition of a 10cm3 portion of 0.08 m naoh to 500cm3 of this buffer solution. iii. calculate the ph following the addition of a 10cm3 portion of 0.08 m hcl to 200cm3 of the original buffer solution.

How many moles of potassium hydroxide are needed to completely react with 2.94 moles of aluminum sulfate according to the following equation: