Consider a solution of an unknown salt having the general formula BHCl, where B is one of the weak bases in Table 13.3. A 0.10-M solution of the unknown salt has a pH of 5.82. What is the actual formula of the salt?

Table 13.3.

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TABLE 13.3 Values of K, for Some Common Weak Bases Conjugate Acid Name Ammonia Methylamine Ethylamine Aniline Pyridine Formula NH3 CH3NH₂ C2H5NH2 CoH5NH2 C5H5N NH4+ CH3NH3 + C₂H5NH3 C6H5NH3 CsH5NH* + + Kb 1.8 X 10-5 10-4 10-4 10-10 10-⁹ 4.38 x 5.6 x 3.8 X 1.7 X