4 · Acids – Bases Solutions______________________________
STATION 6 – ACID STRENGTH, Ka
H2SO4, Ka1 = very large; Ka2 = 1.2 x 10-2
HF, Ka = 7.2 x 10-4
NH3, Kb = 1.9 x 10-5
HCN, Ka = 6.2 x 10-10
Use this information to rank the following acids from weakest to strongest. Justify your choices using Ka’s.
HCN, NH4Cl, HF, HSO4weakest
Ka values
pKa values
strongest