A standard solution of Ba(OH)2 (concentration 0.25 mol dm-3) was added to 50 cm3 of a HNO3 solution, concentration unknown. On addition of 28.35 cm3 Ba(OH)2, the equivalence point was reached. What is the concentration (in mol dm-3) of the HNO3 solution?

Do polar molecules have ionic bonds?

Which process describes vaporization that takes place below the surface of a liquid? condensation melting boiling evaporation

Before it was launched, a helium-filled balloon had a pressure of 201 kpa at a temperature of 27°c. at an altitude of 15,000 m, the pressure had decreased to 2.5 kpa and the temperature had dropped to -14 °c. the volume of the balloon increased to 59.3 m3. what is the original volume of the balloon? 13 m3 0.85 m3 0.077 m3 1.17 m3