ANSWERS for Acids & Bases Questions

1a) basic due to nitrite    b) acidic due to Zn ion (transition metal)  
c) acidic due to hydrogen sulfate   d) acidic due to ammonium   e) neutral

2) hypoiodous < acetic < hydrofluoric < nitric
Acid strength increases as Ka increases. Nitric acid is a strong acid & its Ka approaches "infinity".

3a) -0.70  (HBr is a strong acid)  b) 13.00 (KOH strong base)  
c) 1.57  do ICE chart, use Ka for HCNO      d)  9.38   do ICE, use Kb for acetate

4) 4.4 x 10 exp-10   (i.e. 10 to the -10 power); 2.3 x 10 exp-5

:-)