A buffer solution is prepared by mixing 400 cm3 of 0.60 mol dm-3 propanoic acid, CH3CH2COOH\text{CH}_3\text{CH}_2\text{COOH}CH3CH2COOH, with 600 cm3 of 0.50 mol dm-3 sodium propanoate, CH3CH2COONa\text{CH}_3\text{CH}_2\text{COONa}CH3CH2COONa. Given that Ka K_a\,Ka for propanoic acid is 1.35 × 10-5 mol dm-3 at this temperature, what is the pH of the resulting buffer solution?
4.774.774.77
4.794.794.79
4.874.874.87
4.974.974.97