Question #1: If 200 mL of 0.300 M Cr(NO3)3(aq) is added to 100 mL of 4.0 * 10^-4 M NaF(aq) at 25 degrees celcius, will a CrF3 precipitate form? For CrF3 in water at 25°C, Ksp = 6.6 * 10^-11.
Question #2: The 3dxy orbital has its high probability regions lying between the x and y axes. The 3dz2 orbital has its high probability regions mainly on the z axis. The ligands in a complex ion with coordination number six lie on the x, y, and z axes. Which statement is true for the orbitals in this complex ion?
(a) The 3dxy and 3dz2 orbitals have the same energy.
(b) The 3dxy orbital has a higher energy than the 3dz2 orbital.
(c) The 3dxy orbital has a lower energy than the 3dz2 orbital.
Q#1: 3 NaF + Cr(NO3)3 = 3 NaNO3 + CrF3
CrF3 <-> (Cr+3) + 3(F-1) [Cr+3 : cromium ion with +3 charge, F-1: Fluoride ion with -1 charge]
Before mixing, concentration of Cr ion, [Cr+3] ...
In first problem, using given data it is estimated that whether in given reaction precipitation will be formed or not. In second problem corresponding to coordination number right answer is chosen