Question
Posted on: October 1 2013How do you calculate the amount of elemental phosphorus in a solution?
Following preparation is given to a patient on neonatology:
Phosphoric acid BF5:3.4 g
Na2HPO 4.2 H2O: 4.8 g
Water up to 100ml
Now one asks how much elemental phosphorus/ml contains this solution
Answer
The atomic mass of phosphorus is 31
You are looking for the molecular Maasa of your 2 phosphorus-containing compounds
Phosphoric acid BF V contains 83% phosphoric acid!
The atomic mass of phosphorus is 31.
And now three lines of three
For 3.4 g phosphoric acid I find 0.885 elemental phosphorus and for 4.8 g Na2HPO 4.2 aq 0,836
and add it now. This is then the amount of phosphorus for 100 ml
So "simple comme bonjour!"