a. 0.12 M KNO2 b. 0.50 M NH4NO3 **PLEASE SHOW WORK** Formula Name Value of K. HS

Question

a. 0.12 M KNO2
b. 0.50 M NH4NO3
**PLEASE SHOW WORK** Formula Name Value of K. HSO HCIO2 HC2H,CIO HF HNO2 HC2H,O2 IA(H,O HOCI HCN Hydrogen sulfate ion Chlorous acid Monochloracetic acid Hydrofluoric acid Nitrous acid Acetic acid Hydrated aluminum(III) ion Hypochlorous acid Hydrocyanic acid 1.2 × 10-2 1.2 × 10-2 1.35 × 10-3 7.2 x 104 4.0 x 104 1.8× 10-5 1.4× 10-5 3.5× 10-8 6.2 × 10-10 Formula Name NH, CH,NH2 Methylamine C2H NH2 Ethylamine C,HNH2 Aniline C,HyN Kb 1.8× 10-5 4.38 × 10-4 5.6× 10-4 3.8× 10-10 1.7× 10-9 Ammonia C,HNH2 Ethylamine Pyridine

Explanation / Answer

a. 0.12 M KNO2

KNO2 is a salt of strong base weak acid . so that it is basic

pH = 7+1/2(pka+logc)

pka of HNO2 = -logka = -log(4*10^(-4)) = 3.4

   = 7+1/2(3.4+log0.12)

   = 8.24

b. 0.50 M NH4NO3 is a salt of strong acid weakbase.so that it is acidic

pH = 7-1/2(pkb+logc)

pkb of NH4OH = -logkb = -log(1.8*10^(-5)) = 4.74

   = 7-1/2(4.74+log0.5)

   = 4.78

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