Total volume of sample: 400 mL Trial123Final volume of Na2S2O3, mL126.96.36.199Initial volume of Na2S2O3, mL01.22.3
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R. J. C. De Guzman / Chemistry 26.1 (2017) P a g e | 5Net volume of Na2S2O3, mL188.8.131.52DO Content, ppm O22.1693 1.98851.9885Average DO Content, ppm O22.049RSD41.59451613pptConfidence Interval 2.048631741±0.211547453B.Working Equations[Na2S2O3]std=(0.15gof KIO3214.0gmolKIO3)(6mol Na2S2O31mol KIO3)(0.994)(0.010Laliquot0.1Ltotal volume)Volumeof Na2S2O3, L4molS2O32−¿1molO2¿¿(LNa2S2O3used)([Na2S2O3]std)¿ppmO2=¿C.Sample Calculations 1.Molarity of the standard Na2S2O3 solution (All Trials) [Na2S2O3]std=(0.15gof KIO3214.0gmolKIO3)(6mol Na2S2O31mol KIO3)(0.994)(0.010Laliquot0.1Ltotal volume)0.037LNa2S2O3[Na2S2O3]std=0.011298307M0.011M2.PPM O2 of the water samples (mg/L)
R. J. C. De Guzman / Chemistry 26.1 (2017) P a g e | 64mmol S2O32−¿1m molO2¿¿(32m gO21m molO2)(0.0012) (0.011298307)¿ppmO2,trial1=¿4mmol S2O32−¿1mmol O2¿¿(32mgO21mmol O2)(0.0011) (0.011298307)¿ppmO2,trial1=¿4mmol S2O32−¿1mmol O2¿¿(32mg O21mmolO2)(0.0011) (0.011298307)¿ppmO2,trial1=¿Average ppm O2=2.049ppm3.Relative Standard Deviation(RSD) and Confidence Interval RSD=Standard DeviationMean(1000ppt)=0.0852118462.048631741(1000ppt)=41.59451613pptConfidenceLimits(95%confidencelevel)=mean ±t(standard deviation)√n=2.048631741±4.30(0.085211846√3
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