Identify a good buffer. small amounts of both a strong acid and a strong base significant amounts of both a weak acid and a strong acid significant amounts of both a weak acid and its conjugate base small amounts of both a weak acid and its conjugate base significant amounts of both a strong acid and a strong base

The wave shown on the electromagnetic spectrum disturb the medium it passes through a)different frequency. b)the same frequency .

How many moles are in 43.9 l of oxygen

)benzene and toluene form nearly ideal solutions. consider an equimolar solution of benzene and toluene. at 20 °c the vapour pressures of pure benzene and toluene are 9.9 kpa and 2.9 kpa, respectively. the solution is boiled by reducing the external pressure below the vapour pressure. calculate (i) the pressure when boiling begins, (ii) the composition of each component in the vapour, and (iii) the vapour pressure when only a few drops of liquid remain. assume that the rate of vaporization is low enough for the temperature to remain constant at 20 °c.