What is the pH at 25 ∘C of water saturated with CO2 at a partial pressure of 1.10 atm ? The Henry's law constant for CO2 at 25 ∘C is 3.1×10−2mol/L3.1×10−2mol/L-atm. The CO2 is an acidic oxide, reacting with H2O to form H2CO3

Consider hydrogen in an excited state n = 5n=5 that emits photons to reach the ground state. there are various possible transitions other than straight to the ground state that can occur; for example, it can drop to the n = 3n=3 state followed by the n = 3n=3 to the ground state transition. which of the possible transitions will result in the emission of a photon in the visible region?