For stubborn stains you may have to apply the phosphoric acid full strength.
In the series sulfonic-sulfinic-sulfenic acids, both the acid strength and stability diminish in that order.
Also, you may want to think about what acid strength means.
In terms of acid strength, it is much stronger than acetic acid.
The number of electronegative atoms adjacent an acidic bond also affects acid strength.
As if darkness itself possessed some acid strength that could devour pearls, the amazing phenomenon continued until almost complete.
With the same central atom E, acid strength increases as the number of oxygen attached to E increases.
Also, electron-withdrawing groups substituted at the ortho and para positions, enhance the acid strength.
It can also be expressed as a percentage of sulfuric acid strength; for oleum concentrations, that would be over 100%.
This I completely disagree with and was hoping you could clear up some general questions about the order in acid strengths ex.