分析化学实验报告

2009-02-18 20:08:58| | | 1215 1. 2. 3 na2co3 + 2hcl = 2nacl + co2 + h2o khc8h4o4 + naoh =knac8h4o4 + h2o1 0.1.mol/l hcl42ml500ml 2 0.1mol/l naoh2gnaohco2500ml, 3 0.1 mol/l hcl 0.15 0.20 gna2co3 250ml2030 ml12hclhcl 40.1mol/l naoh1 khc8h4o4 0.40.5 g250ml 2030ml23 naoh 30s naoh 2 25.00ml naoh 12 hcl 3 0.2%1. 23 2. na2co32030mln=m/m,c3phph8.09.6co2ph8.0 4hclna2co3na2b4o710h2o na2co3na2b4o710h2o39% na2s2o3 1216 1. na2s2o3 2. k2cr2o7na2s2o3 3. cr2o72- + i- +14h+ =2cr3+ + 3i2 + 7h2o i2 + 2s2o32- = 2i- + s4o62-na2s2o3 cr2o72- 3i2 6s2o32-cna2co3(mol/l) =6ck2cr2o7*vk2cr2o7/vna2s2o3 10.004167mol/lk2cr2o70.1226g 25ml 100ml 2010mol/lna2s2o3na2s2o35h2o6.2g,0.2gna2co3,1000 ml,na2co310250ml1gki50 ml10.00ml 0.004167mol/lk2r2o71 ml0.51+5h2so45minna2co3,1ml0.5%n a2s2o3na2s2o3vml23 1na2s2o3 s,so32- 2na2s2o3co2o2cu2-fe3+na2co3na2co3na2co33k2cr2o7na2s2o3 k2cr2o7naoh na2co3 1218 12naohna2co3 hclv1naohna2co3nahco3hclnahco3co2v2v2v1v2 125.00ml1.31.5 g250mlco2250mlco2 225.00ml250ml230.10 ml/lhclhclv112hclhclv2.v1v2naoh n a2co3 wnaoh = chcl*(v1-v2)*mnaoh*100%/0.1m wna2co3 = 2chcl*v2mna2co3*100%/0.1m 1na2co3nahco3na2co3 naoh na2co3nahco3 wna2co3 = 2chcl*v1mna2co3*100%/0.1mw nahco3 = chcl*(v2-v1)*m nahco3*100%/0.1m2 1v1=0,v2>0 (2)v1>0,v2=0 (3)v1>v2 (4)v1v2 (5)v1=v2(1) nahco3; (2)naoh(3) naohna2co3 (4) na2co3 nahco3 (5) na2co3 3hcl naohnahco3hclnaohhclnahco3hcl 1222 1 2 mn2+ +2oh- = mn(oh)2 2mn(oh)2 + 1/2o2 = 2mn(oh)3 () mn(oh)2 + 1/2o2 = 2mn(oh)2 ()2mn(oh)3 +2i- + 6h+ = 2mn2+ + i2 + 6h2o mno(oh)2 + 2i -+ 4h+ = mn2+ i2 + 3h2o i2 + 2s2o32- = 2i- + s4o62-na2s2o3do(o2,mg/l) =0.25cna2s2o3vna2s2o3*32*103/v 10s1mlmnso42ml15445mlh2so3h2so45min100ml250ml0.01mol/lna2s2o31ml0.5%na2s2o3na2s203v(ml)231 mnso4ki 2 10s?o2o2 kmno4 1223 1 kmno42 na2c2o4kmno4 3 kmno4 2mno4 - + 5c2o42- + 16h+ = 2mn2+ + 10co2 +8h2o 1 ckmno4=0.02mol/l kmno4kmno41.6g 500ml1h23d2 na2c2o4kmno40.150.20g na2c2o43250m50ml10ml1+3k2so4,7585kmno4mn2+30s55 0.2% : : 1 10.1mol.l1hcl20.1mol.l1naoh21 2110.1mol.l1hcl2hcl3 1edta210.05mol.l-1na2s2o32() 550025hclnaohkhc8h4o4naohkhc8h4o4ph1. 2. . 1. 0.5000g 30.0000 g0.0000 g0.5000 g0.5000g;2. 0.300.32 g 3 0.0000 g1 0.0000 g -0.30-0.32 g 0.4mg0.32 g 1 12 3m/g 0.5040.500 0.50321 2 3 m/g 36.678 36.990 37.296m1 -0.313 -0.303 -0.313m(+)/g 36.990 37.29637.607m2/g 0.3120.306 0.311m2-m1/mg1 3 -21. 2. 3. 4.0.4 mg0.2mg20.4mghclnaohhclnaohph7.0ph4100.1moll-1ph3.14.4ph4.46.2ph8.09.6hclnaohvhcl/vnaohhcl naoh (1 gl) 2 gl,50 ml 50 ml50 ml 50 ml 25 ml) -1-11. hclnaoh5mlhcl500ml0.1mollhcl2gnaoh500ml0.1mollnaoh2g2. hclnaoh2025mlnaoh10.1mollhcl225.00ml 0.1hcl250ml23-1-1-10.1mollnaoh30s3naoh0.04ml- 11 hclnaoh 1 23vnaoh/ml20.00 22.01 20.25vhcl /ml17.45 19.31 17.85vhcl/vnaoh 0.87250.87730.8815vhcl/vnaoh 0.8771/% -0.5244 0.028024 0.84372 naohhcl 1 2 3vhcl /ml 25.00 25.00 25.00vnaoh/ml 30.38 29.47 29.78vnaoh/ml 29.88vnaoh/ml 0.50 -0.41 -0.101