A soft drink was bottled with a partial pressure of `CO_(2)` of 3 bar over the liquid at room temperature . The partial pressure of `CO_(2)` over the solution approaches a value of 30 bar when 44 g of `CO_(2)` is dissolved in 1 kg of water at room temperature . The approximate pH of the soft drink is _______ `xx 10^(-1)` .
(First dissocation constant of `H_(2) CO_(3) = 4.0 xx 10^(-7)` , log 2 = 0.3 , density of the soft drink = 1 `g mL^(-1)`)