Asynthesis reaction is shown in which a and b represent two reactants forming a compound c. a + b → c which of the following values is used in the stoichiometric calculations to determine the limiting reactant for the reaction?

a. mole ratio of a to b
b. mole ratio of b to a
c. starting amount of c in grams
d. starting amount of a in moles

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.