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Given:
Ksp (CaF2) at 25 degrees Celsius = 3.9 x10^-11
volume of CaCl2 = 100 ml
concentration of CaCl2 = 2.3 x 10^-4 m
Volume of NaF = 500 ml
concentration of NaF = 5.0x10^-3 m
Total volume = 100 + 500 = 600 ml
balanced chemical equation:
2NaF + CaCl2 ===> CaF2 + 2NaCl
calculate the number of moles NaF and CaCl2. Then determine the resulting moles of CaF2 (based on the limiting reactant) and find the concentration of CaF2. If it is more than the Ksp, meaning there will be a precipitate.
Answer:
[Co(NH3)5CO3]I3
Explanation:
The naming of coordination compounds follows certain rules specified by IUPAC. Usually, the name of the complex makes it quite easy to deduce its structure.
"Pentaamine" means that there are five NH3 ligands as shown in the structure. The ligand carbonato is CO3^2-. It has no prefix attached to it in the IUPAC name of the complex hence there is only one carbonato ligand present(recall that the complex has a coordination number of six). I did not enclose it within parenthesis as required in the question.
Lastly the III that appeared after the metal name "cobalt" shows its oxidation state. The iodide counter ions must then be 3 in number in order to satisfy this primary valency of the metal hence the inclusion of I3 in the structure of the complex.
Remember this:
atomic mass= atomic number + number of neutrons
The atomic number (same thing as number of protons) in this case is 15. The atomic mass is 31.
So, we subtract 15 from 31 to find the number of neutrons.
31-15=16
16 neutrons!!!