Which solution will be more acidic; that is, which will have a lower pH?
(a) 0.10 M C6H5OH (phenol) or 0.10 M C2H5OH (ethanol)
(b) 0.10 M NH3 or 0.10 M NH4Cl
(c) 0.10 M NaCl or 0.10 M NH4Cl
(d) 0.10 M CH3CH(OH)COOH (lactic acid) or 0.10 M CH3COOH
(e) 0.10 M ascorbic acid (vitamin C, pKa = 4.12 or 0.10 M acetic acid
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