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ng.com/ibiscms/mod/ibis/view.php?id-5005888 saplinglearning.comx Ip x Strong Acids/Bases - Chempen..D 3/26/2018 06:00 PM PrintC 52.2/1003/21/2018 10:38 PM CalculatorPeriodic Table Question 22 of 32 Sapling Learning Using chemical equations, show how the triprotic acid H3PO4 ionizes in water. Phases, such as (0 or (aq), are optional. 7.25x 10 6.31 x 10s 4.80 x 10 13 There is a hint available View the hint bottom dividor bar, Click on the divider bar again to hide the hint Close Previous > Give Up & View Solution e, Check Answer Next Exi privacy polity o search 0.

Explanation / Answer

Phosphoric acid is a weak acid, meaning that it does not dissociate completely. Each ion is progressively weaker as H+ is removed.

H3PO4(aq) + H2O(l) H3O+ + H2PO-4

Ka1 = 7.25×103 = ([H3O+][H2PO4-])/[H3PO4])

H2PO-4 + H2O(l) H3O+ + HPO2-4

Ka2 = 6.31×108 = ([H3O+][HPO42-])/[H2PO4-])

HPO2-4 +   H2O(l)    H3O+ + PO3-4

Ka3 = 3.98×1013 = ([H3O+][PO43-])/[HPO42-])

Ka1 >> Ka2 = almost all the H3O+ is formed in the first step.

Ka3 will only happen under very basic conditions.

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