Write the rational formalas of the following compounds​

What is the ph of a 0.0010 m hno3? 1.0 3.0 4.0 5.0

How do you know when a chemical reaction has occurred

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?