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- Define ionization enthalpy and electron gain enthalpy?II. A.Give at least 3 primary standards for standardization of (a) HCl, H2SO4, (b) NaOH, KOH, Ba(OH)2 B. State the properties of each primary standards and the limitations as to its application. pls answer BHCl(aq)+NaOH(aq)→NaCl(aq)+H2O(l) Calculate ΔHrxn for the reaction at 3 different concentrations of HCl as listed in the image provided. Please state how the concentration of acid affect the heat of reaction (ΔHrxn)between a strong acid (HCl) and a strong base(NaOH)?