Read the oxoacids of phosphorus

You will write a program that reads the groups on the phosphorus atoms of an acid and works out its oxidation state, its basicity and the base it needs.

The idea. Each acid is described by five numbers: P-H bonds, P-OH groups, P=O bonds, bridging oxygen atoms and phosphorus atoms. The oxidation state of phosphorus comes from the hydrogen and oxygen counts. The basicity is the number of P-OH groups.

Your tasks.

1. Complete oxidation_state(name). Count the oxygen atoms (P-OH, P=O and bridging) and the hydrogen atoms (P-H and P-OH). Use $(2 \times \text{oxygen} - \text{hydrogen}) / \text{phosphorus atoms}$.
2. Complete basicity(name) so that it returns the number of P-OH groups.
3. Complete naoh_needed(name, mmol) so that it returns the mmol of sodium hydroxide that neutralise that amount of the acid.