Question

ch 14 reg hw:

5) When 0.0034 moles of a weak acid are dissolved in enough water to make 0.500 L, the pH of the resulting solution is 5.86. Calculate Ka.

23) Phenol (C6H5OH, also called carbolic acid) has a pKa of 9.89. It is used to preserve body tissues and is quite toxic. Calculate the percent ionized in 0.0789 M phenol--a dilute solution.

Answer 1

Mo ot moles ot leak aud (say HA) 0.0034 Yolume D 500L Cres+) 대肜 0 500 Given PH# 586 -5-8 6 Now , becaun HP ls a weak aud..ih cags iniltal conc: 0068M Equilieme: (0.00 68-1.38xojm (f-38 х#5m @sPA的M. Conc (0.0068 38) 6 006748 - 12 ←10 → | Ka = 2.8014 × 10