If a buffer solution is 0.290 m in a weak acid (ka = 5.4 × 10-5) and 0.570 m in its conjugate base, what is the ph?

What are the primary responsibilities of a chemical engineer involved in "r& d"? develop large scale manufacturing operations discover new products and processes training of new chemists determine products needed by consumers

Which of the following would be an accurate picture of the earth during the summer time of the northern hemisphere?

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?