Given that the wavelength of maximum absorption for chromium is 574.7 nm, what is the energy per cr atom of the transition for an electron to move from one d orbital to another of higher energy? (h = 6.626 x 10-34 js/particle, c = 3x108 m/s)

Abeaker with 2.00×102 ml of an acetic acid buffer with a ph of 5.000 is sitting on a benchtop. the total molarity of acid and conjugate base in this buffer is 0.100 m. a student adds 4.70 ml of a 0.360 m hcl solution to the beaker. how much will the ph change? the pka of acetic acid is 4.740.