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02-23-2008, 09:26 PM
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| Hard Chemistry problem!? .4157-g sample is dissolved in 50 mL of water in a titration experiment to determine the molar mass and ionization constant, Ka, of lactic acid. The lactic acid solution is titrated with standardized .1085 M NaOh solution at a temperature of 25 C. The equivalence point is reached after 42.53 mL of base added. Lactic acid is a monoprotic acid that may be represented as HLac. The molar mas of HLac has been determined to be 90.1 g/mol The pH of the solution is 2.81 after 15 mL of base is added. Calculate the ionization constant, Ka, of lactic acid. How do you do it??      |
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