Antoine Lavoisier burned metals in sealed jars. What is your prediction of his experimental results? The mass of the jar and contents varied unpredictably as the conservation of mass depended upon the metal being burned.

The mass of the jar and contents increased after the metal was burned.

The mass of the jar and contents remained the same after the metal was burned.

The mass of the jar and contents decreased after the metal was burned.

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.