==Clarification== Phosphoric acid is a weak acid, as it does not fully dissociate into its component ions. imagine that HCl is added to a buffer solution containing the weak acid phosphoric acid and a salt a)will HCl react with weak acid (H3PO4), or will it react with the salt (Na2HPO4)? The conjugate acid of any species, is that species plus a proton; so it's H_2PO_4^(-). The steps of dissociation are below: H3PO4 --> H+ + H2PO4(-) Archived. EN Of As Is 2.0, And EN Of P Is 2.1. Examples of strong acids are hydrochloric acid (HCl), perchloric acid (HClO 4), nitric acid (HNO 3) and sulfuric acid (H 2 SO 4). Why is HPO4-2 a weak acid? I Thought The Larger Atom Size Of As Would Make H3AsO4 The Stronger Acid. Close. ... im in the same class & our chem teacher didn’t teach us how to identify strong/weak bases/acids in this way yet. Question: Why Is H3PO4 A Stronger Acid Than H3AsO4 ? b)one product of this thanks! 2. As Is A Larger Atom Than P. Yes, P Has A Larger EN, But Not By Much. The product is then hydrated with water to form strong phosphoric acid (in the liquid state). What is the conjugate acid of H_2PO_4^(-)? So, certainly, the conjugate base twice removed of phosphoric acid is going to be a weaker acid than it's bigger, stronger brother H3PO4. P 2 O 5 + 6 H 2 O -> 2 P 2 O 5 In the final step, high-pressure-drop demisters are used to remove the phosphoric acid mist from the combustion gas stream. could you explain further because we are still a little confused. 8 months ago. Strength of an HA (HF, HCl, H2S) acid depends on the difference of electronegativity between H and A - the more electonegative is A the stronger the acid. See also here. It is an acid, but it is a weak acid because of its low first dissociation constant. When we add a proton, we must conserve both mass and charge, we add H^+ to HPO_4^(2-) so the conjugate acid is simply H_2PO_4^(-). Posted by. #1)hydrochloric acid is a relatively strong acid . Acid strength is the tendency of an acid, symbolised by the chemical formula HA, to dissociate into a proton, H +, and an anion, A −.The dissociation of a strong acid in solution is effectively complete, except in its most concentrated solutions.. HA → H + + A −. HI because I is very electronegative and H3PO4 because the oxidation degree of P is 5+ (maximal possible degree of oxidation). Well, for one thing, the parent compound (phosphoric acid) is a weak acid to begin with. If HPO4 2- is an acid, is it a strong acid or a weak one? u/troyquack. Defines strong and weak acids and the acid ionization constant. Why is HPO4-2 a weak acid? (Hydrochloric, sulfuric, and nitric acids are stronger, but acetic acid is weaker).