Question HLPaper 1AAnswerWhich combination is a buffer solution?A50 cm3\mathrm{cm}^3cm3 of 0.10 mol dm−3\mathrm{mol \, dm}^{-3}moldm−3 NaOH (aq) and 25 cm3\mathrm{cm}^3cm3 of 0.10 mol dm−3\mathrm{mol \, dm}^{-3}moldm−3 HCl (aq)B25 cm3\mathrm{cm}^3cm3 of 0.10 mol dm−3\mathrm{mol \, dm}^{-3}moldm−3 NaOH (aq) and 25 cm3\mathrm{cm}^3cm3 of 0.10 mol dm−3\mathrm{mol \, dm}^{-3}moldm−3 HCl (aq)C25 cm3\mathrm{cm}^3cm3 of 0.10 mol dm−3\mathrm{mol \, dm}^{-3}moldm−3 NH3NH_3NH3 (aq) and 50 cm3\mathrm{cm}^3cm3 of 0.10 mol dm−3\mathrm{mol \, dm}^{-3}moldm−3 HCl (aq)D50 cm3\mathrm{cm}^3cm3 of 0.10 mol dm−3\mathrm{mol \, dm}^{-3}moldm−3 NH3NH_3NH3 (aq) and 25 cm3\mathrm{cm}^3cm3 of 0.10 mol dm−3\mathrm{mol \, dm}^{-3}moldm−3 HCl (aq)
