The ka of hydrofluoric acid (hf) at 25.0 degrees celsius is 6.8*10-4. what is the ph of a 0.15m aqueous solution of hf? the ka of hydrofluoric acid (hf) at 25.0 c is 6.8 x10-4. what is the ph of a 0.15 m aqueous 8) solution of hf? a) 4.60 b) 0.82 c)3.64 d) 1.17 e) 2.00

What best discribes the relationship between wavelength and frequency in a electromagnetic wave

Which statement correctly describes the phosphate ion, ? it is composed of one phosphorus atom and four oxygen atoms covalently bonded together, and there is a –3 charge distributed over the entire ion. it is composed of one phosphorus atom and four oxygen atoms covalently bonded together, and there is a –3 charge on the phosphorus atom. it is composed of one phosphorus atom and four oxygen atoms ionically bonded together, and there is a –3 charge distributed over the entire ion. it is composed of one phosphorus atom and four oxygen atoms ionically bonded together, and there is a –3 charge on the phosphorus atom.

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?