HOCl(aq) = OCl - + H+ a
Ka = 2.95x10 -8 = 10 -7.53
HOBr(aq) = OBr - + H+ a
Ka = 2.34x10 -9 = 10 -8.63
HOI(aq) = OI - + H+ a
Ka = 2.29x10 -11 = 10-10.64
H2 O(aq) = OH - + H + a
Kw = 1.0693x10 -14 = 10-13.997
Rank the following nine solutions from lowest to highest pH. To answer this problem, you will need to work
problems out to "one equation and unknown", but it shouldn't be necessary to actually calculate pH.
(i) 1.0x10 -3 M HOI (iv) 5.0x10-4 M HOI (vi) 1.0x10 -3 M NaOH (ix) 1.0x10-3 M HCl
5.0x10 -4 M NaOI 1.0x10-3 M NaOCl
(ii) 1.0x10-3 M HOBr (vii) 1.0x10-3 M HCl
(v) 1.0x10 -3 M NaOI
(iii) 1.0x10 -3 M HOCl (viii) 1.0x10-3 M NaOH
1.0x10-3 M HOI