Question

is phosphoric acid strong or weak?​

Answer 1

hey mate❤️❤️❤️

here is ur answer

phosphoric acid is weak

hope it will help u

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Answer 2

Answer:

no phosphoric acid is not a strong acid

Explanation:

o briefly answer your question, no, phosphoric acid is not a strong acid, as it does not fully dissociate into H+ (H3O+) and the dihydrogen phosphate ion when dissolved in water; water's minimal comparative alkalinity is incapable of removing a proton from all phosphoric acid molecules, illud est, a system at equilibrium will exist. For instance, the pH of a 1.0 M solution of phosphoric acid in water can be calculated as follows:

H3PO4 + H2O <<>> H3O+ + H2PO4-

   1.0 M           --           1.0e-7 M       0.0 M

  - x                                   + x                 + x

1.0 M                                  x M              x M

(Note: the loss of concentration of phosphoric acid is so minimal that it can be ignored altogether. Conversely, the increase in concentration of hydronium is much greater than the initial concentration.)

Ka = [H3O+][H2PO4-]/[H3PO4]

6.9 x 10 ^ -3 = x^2  

x = [H3O+] = 0.0

 

pH = -log[H3O+] = 1.08

While phosphoric acid is quite acidic, it is evident that it is, indeed, a weak acid because of the lack of full dissociation in water; a 1 M solution of strong acid would be around 0 (0 for monoprotic species, possibly less for diprotic due to an additional hydrogen ion). Bottom line: Due to the strength of the phosphate ion and the weak alkaline properties of water, 1 M phosphoric acid doesn't dissociate entirely such that the concentration of hydronium is likewise 1 M.