# chapter17 - Homework Chapter 17 17.6 Brnsted acid HPO42(aq...

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Homework Chapter 17 17.6 Brønsted acid: HPO 4 2– (aq) + H 2 O( l ) ' H 3 O + (aq) + PO 4 3– (aq) Brønsted base: HPO 4 2– (aq) + H 2 O( l ) ' OH (aq) + H 2 PO 4 (aq) 17.14 pOH = 14.00 – pH = 3.34 [OH ] = 10 –pOH = 10 –3.34 = 4.6 × 10 –4 M g OH Ba mol g OH mol OH Ba mol L L OH mol 3 2 2 4 10 9 . 4 ) ( 1 3 . 171 2 ) ( 1 125 . 0 1 10 6 . 4 × = × 17.16 (a) The strongest acid is HF (largest K a ) and the weakest acid is HPO 4 2– (smallest K a ). (b) F (c) The strongest acid (HF) has the weakest conjugate base. (d) The weakest acid (HPO 4 2– ) has the strongest conjugate base. 17.24 p K a = –log( K a ) = –log(2.4 × 10 –11 ) = 10.62 17.32 K a = 10 –p K a = 1 0 –3.95 = 1.1 × 10 –4 11 4 14 10 9 . 8 10 1 . 1 10 0 . 1 × = × × = = a w b K K K 17.50 C 6 H 5 OH + H 2 O ' C 6 H 5 O + H 3 O + mol L mol g g OH H C mol 0166 . 0 125 . 0 ) / 11 . 94 / 195 . 0 ( 5 6 = = C 6 H 5 OH C 6 H 5 O H 3 O + I 0.0166 0 0 C -x +x +x E 0.0166 – x x x

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[] [ ] [] x x OH H C O H O H C K a = = × = + 0166 . 0 10
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chapter17 - Homework Chapter 17 17.6 Brnsted acid HPO42(aq...

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