Distilled water (H20) can be made from tap water by removing dissolved minerals and various other chemicals. How should each type of water be classified?

A. Tap water is a homogeneous mixture and distilled water is a pure substance,

B. Tap water is a heterogeneous mixture and distilled water is a pure substance,

C. Tap water is a pure substance while distilled water is a homogeneous mixture.

D. Tap water and distilled water contain hydrogen and oxygen, therefore they are both pure substances,

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.