(完整版)2018年金钥匙科技竞赛初赛(附答案)

2018CESL60100H:1C:12N:14O:16Na:23S:32Cl:35.5Ca:40Fe:56Cu:64Ag:108201~15230116~20315121121.A.B.C.D.2.A.B.C.D.3.ABCD-70-1104.A.B.C.D.5.A.B.pHC.D.6.A.NH4ClB.Ca3(PO4)2C.K2CO3D.KNO37.A.2C+O22COB.2Fe+6HC12FeCl3+3H2OC.NaOH+H2SO4Na2SO4+H2OD.CO2+H2OH2CO3O2N2CO2HNO3NaClNH3H2ONa2SNa2SO3Na2SO4ZnAgCu8.A.pH=13B.pH=8C.D.9.A.B.C.D.10.A.B.C.D.11.A.B.C.D.1112.:Na2CO3+H2O+CO22NaHCO3yA.B.C.D.13.A.B.C.D.14.60%50gA.6gB.8gC.13.2gD.20g15.FeCl3aFeCl3+bCucCuCl2+dX32.5gFeCl3FeCl3CuCl2A.XFeCl2B.c=1C.ab12D.X25.4g16.XCuSO4XA.B.C.D.17.ABKClK2CO3CCaCl2NaClDNaOHBaCl218.CO2A.B.CO2C.CO2CO2D.CO22NaHCO3+CaCl2CaCO3+CO2+2NaCl+H2O19.KNO3NH4ClA.NH4ClB.t2C.t3100gKNO3NH4ClD.t2t120.XYXYCoCo+2HCl()CoCl2(+H2(A.Co12B.2CoC.CoCl2H2D.1900260032821.8(1)(2)3C60C6022.101112NaHCO33)42Na2O2+2H2O4NaOH+O22Na2O2+2CO22Na2CO3+O2Na?O223.10ADFDFDBCE1601)BD234E32724.7O2H2CO21AZn2BAO2abcBAH2abc3CO2ABB25.14pH1pH7.5~910~11.912~14125mLpH123pH23b23c3pH26.6NaCl0.9%NaCl3g~5g10.9%200gNaC1g265g1.435gNaCl+AgNO3AgC1+NaNO3