What do scientists generally do if they are not sure what the  expected value of a measurement should be?

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

What are the first two quantum numbers for the electrons located in subshell 4d? what are the first three quantum numbers for the electrons located in subshell 2s? how many electrons can be held in a sublevel l = 3? how many electrons can be held in the energy level n = 4? how many electrons in an atom can share the quantum numbers n = 4 and l = 3?

Is heavenly controller dating someone?