a) In this titration you used hydrochloric acid of known concentration. A technique referred to as standardising the solution is often performed on assets prior to the titration to ensure an accurate concentration is known. Why?​

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?