When chromium metal is added to nitric acid, the following reaction takes place
Cr (s) + 6 HNO3 (aq) + Cr(NO3)3 (aq) + 3 H2O (1) + 3,
NO2 (g)
Calculate the volume of NO2 gas (in L) collected over
water at 40.0 °C when 11.1 g of chromium is added to
excess nitric acid if the total pressure is 675.0 torr. The
vapor pressure of water at 40.0 °C is 55.3 torr.

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.