You have prepared a .2 M histidine solution. Calculate the molar concentration of isoelectric histidine at a) pH 5.5 and b) pH 7.0. A solution is provided, but can you do a step-by-step as I do not quite understand the math that went into this.

Amap that uses a range of colors and shading to represent the elevation, depth, or landscape of specific features on earth is a/an map.

How will the volume of a gas be affected if the pressure is tripled, but the temperature remains the same?

)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.