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1pHA3.1B7.5C6.5D4.22XABCD3ABCD4ABpH7pH7CDCOCO25ABpHpH=1.4CD6ABCD7AFeFe2O3BCaONaOHCDNH4ClNH42SO4NH4+NH38AH+BCD0.9%9NaClO+2HCl=NaCl+X+H2O84HClNaClOABC84NaClOCl1D8410ABCD11pHAcBaNa2SO4H2SO4CDabpH12ABCD13ABCD14ABpH7pH7CD15ABCD16ABCD17ABCD18ABCD19A.KOHBCD20ABCD2112342212323123424123pH7=pH25123426Ca3PO42ACH41233567827CO2NaOHAlNaOHH2NaAlO228T1221%34567829H2SO4NaOHNa2SO4Na2SO4H2SO4Na2SO4H2SO4NaOH1CuSO42pHNa2CO3BaC12pHNa2CO3BaCl2pH7H2SO4H2SO4H2SO42