Calculation of叶H」3O]&[OH] In a strong acid solution Focus on the dominated species, i. e [H3O+ Strong acid dissociates completely Determine whether [H3o*] from H2o can be ignored? Yes> Use strong acid only to calculate [H3o*] No> Should also consider water dissociation Use [H3o*] to calculate [oh-], pH, pOH 11
Calculation of [H 3 O +] & [OH - ] 3 z In a strong acid strong acid sol tion sol ution: Focus on the dominated species, i.e. [H 3 O + ] Strong acid dissociates completely; Determine whether [H 3 O +] from H 2O can be ignored? ¾ Yes Æ Use strong acid only to calculate [H 3 O +]; ¾ No Æ Should also consider water dissociation. Use [ H 3 O + ] to calculate [OH- [ ], pH, pOH. 3 ] [ ] p p 11
Practice Calculate [H3O],[OH], pH, pOH of the following aqueous solution at 25oC 1 MHCI 0.0005MH2SO4 10-6M HCI 10-9 M HC 0.001 M NaOH 10-7 M KOH
Practice z Calculate [H3O+] [OH- z Calculate [H3O ], [OH ] pH pOH of the ], pH, pOH of the following aqueous solution at 25 oC: 1 M HCl 0 0005 M H 0 2SO4 .0005 M H2SO4 10-6 M HCl 10-9 M HCl 0 001 M N OH 0.001 M NaOH 10-7 M KOH 12