Q.3.Which of the following chemical reactions is an acid-base reaction? a. 4 C5H90 (1) + 29 02 (9) - 20 CO2 (g) + 18 H20 (9)
b. Ca (s) + F2 (g) - CaF2 (s)
c. HBr (aq) + NaOH(aq) - H20 (1) + NaBr (aq) O
d. 3 Pb (s) + 2 H3PO4 (aq) - 3 H2 (g) + Pb3(PO4)2 (aq)

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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.