A team of scientists claim that they have discovered a new experimental method for determining atomic mass. Which of the following is necessary for
the claim to be considered valid?
A. Another team of scientists must be able to replicate the results of
the experiment
B. The method must work for all isotopes,
C. The atomic mass of an element according to the new method
must be less than its previous measurement.
D. The atomic mass of an element according to the new method
must be greater than its previous measurement.

Answer asap need to be answered 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.