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0.50M NH4Cl So what makes this salt acidic? It contains NH4+ the conjugate acid of NH3 (kb=1.8 x 10-5). NH3 is a weak base. Cl- is the conjugate base of HCl and does not form. HCl is a strong acid. NH4+ will react with water, remembering acids donate H+. NH4+(aq) + H2O(l) ó NH3(aq) + H3O+(aq)
Set up the ICE box
But we have a kb that must be converter to Ka
Now we can plug in our equilibrium values
X=[H3O+]=1.67 x 10-5M [H3O+] is [H+] pH=-log[H+]=-log1.67 x 10-5M pH=4.78 on to the pH of Basic Salts link Back to Acid Base Links |