Q26 (A). Define an electrolytic cell. Describe with a neat diagram, an electrolytic cell for the decomposition of molten NaCl. Write the reactions at the anode and cathode. (5 Marks) Q26 (B). (a) Evaluate the molarity of a solution that contains 10.50g of Ca(OH)2 in 2250 ml of solution. (2 Marks)

(b) How many grams of water must be used to dissolve 82 g of C6H5COOH to prepare a 1.75 m solution. (3 Marks)

Q26 (C). (a) Explain the following redox reactions: (3 Marks)

(i) 3Ti + 2Cr+3 → 3Ti+2 + 2Cr

(ii) 3Mn + 2Fe+3 → 2Mn+2 + 2Fe

(b) Find the oxidation number of the underlined element in the following: (2 Marks)

(i) C2H4O6-2

(ii) Cr2O5

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.