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A gas compound, HA, has a density of 1.28gL1 at 27C and 0.982atm. The aqueous solution of this gas compound is acidic because of the

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A gas compound, HA, has a density of 1.28gL1 at 27C and 0.982atm. The aqueous solution of this gas compound is acidic because of the partial ionization of HA. When the 2.48g of HA is dissolved in water and diluted to exactly 1.0L, the pH of this solution is measured as 4.98 at 27 C. Calculate the Ka of HA.(R=0.082Latm/molK)

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