A 25.0 mL sample of a saturated Ca(OH)2 solution is titrated with 0.029 M HCl, and the equivalence point is reached after 37.3 mL of titrant are dispensed. Based on this
data, what is the concentration (M) of Ca(OH)2?

Large helium-filled balloons are used to lift scientific equipment to high altitudes. what is the pressure inside such a balloon if it starts out at sea level with a temperature of 10.0ºc and rises to an altitude where its volume is twenty times the original volume and its temperature is – 50.0ºc ?