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19/09/2020 7:41 pm
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A soft drink was bottled with a partial pressure of CO2 of 3 bar over the liquid at room temperature. The partial pressure of CO2 over the solution approaches a value of 30 bar when 44 g of CO2 is dissolved in 1 kg of water at room temperature. The approximate pH of the soft drink is……. × 10-1.
(First dissociation constant of H2CO3 = 4.0 ×10 -7 ; log2 = 0.3; density of the soft drink = 1 g mL-1)
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19/09/2020 7:42 pm
Amount of CO2 in one liter of solution = 4.4. gram = 0.1 Mole
pH = 1/2 {pKa - log C}
For a weak acid solution
pH = 1/2 { 6.4 +1 } = 3.7