The atomic weight of antimony is 121.75 u. there are two naturally occurring isotopes of antimony. 121sb has an isotopic mass of 120.9038 u and has a natural abundance of 57.25%.
what is the isotopic mass of the other isotope 123sb?

a) 122.97 u
b) 122.88 u
c) 123.06 u
d) 122.93 u
e) 122.82 u

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.