K2HC6H5O7 is the second salt of the triprotic weak citric acid H3C6H5O7. Acidity constants for citric acid are Ka1=7.4x10^-4, Ka2=1.7x10^-5, Ka3=4.0x10^-7. An aqueous solution of 10^-3 moles per liter of K2HC6H5O7 is prepared. Please write down the following. a)all chemical reactions b)list of species c)equilibria expression(s) d)mass balance equation(s) e)charge balance f)proton condition