Answers edited by Dave

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• What is the elemental composition of lipids?
  
• I understand you compare Ka values to determine the pH but this order just seems to be all over the place? HCl: strong acid so low pH C6H5NH3Cl: Ka=1.35x10^-5 NH4+ Ka=5.56x10^-10 MgCl2=neutral HClO2Ka=1.2x10^-2 HOCl Ka=4.0x10^-8
  
• 18g glucose is dissolved in 180g of water. The relative lowering of vapour pressure is ? a)1 b)1.8 c)0.01 d)0.001
  
• Anyone have an idea about this chemistry problem?