Complexometric Determination of Water Hardness

Complexometric Determination of Water validity Abstract Create a order EDTA dissolvent for use as a titration dissolving agent to determine the inclemency of piddle from a single random sample. entry Using a calibrated EDTA resolving to determine water cogency from a random sample. Essentially the Na2EDTA resolve reacts peerless to one with the mineral content of a sample of tap water and by use of a commonplaceized solution a ppm estimation can be obtained for the badness of water.Current knowledge in this line of business is well understood and procedures employ follow generally accepted guidelines. Method showtime the calibration was completed using an around . 7340g Na2EDTA/500mL solution. A 1. 000g/L calcium ion solution was apply as the primary standard with approximately 3mL of ammonium chloride as a archetype and Erichrome Black T as the indication solution. Three titrations were performed to ensure truth of the molarity of the Na2EDTA solution. The 1. 000g/L calcium ion solution had to be converted to M so 1g/L/100. g=. 009990M calcium ion solution. Titration 1 10. 00mL CaCO3 . 00999MCaCO3X. 0100L= . 0000999mol CaCO3 . 0000999mol EDTA/. 002507L = . 00398M Na2EDTA Titration 2 10. 00mL CaCO3 . 00999MCaCO3X. 0100L= . 0000999mol CaCO3 . 0000999mol EDTA/. 02339L = . 004271M Na2EDTA Titration 3 9. 95mL CaCO3 . 00999MCaCO3X. 0100L= . 0000994mol CaCO3 . 0000994mol EDTA/. 02367L = . 004196M Na2EDTA Since the first titration is so far out from the other both it was thrown out giving an mediocre result of . 04233M Na2EDTA Sample B was used in this experiment with at 25mL and triplet titrations were performed to ensure accuracy with the same buffer solution (appx 3mL ammonium chloride pH10). A magnetised stirrer and standard burette were used in the procedure with a rede accuracy to . 01mL. Eriochrome Black T was the indicator solution. Results Titration 1 12. 52mL Na2EDTA . 00423M Na2EDTA x . 01252L = . 0000530 mol . 0000530mol/. 0249 6L = . 00212M severeness Titration 2 12. 19mL Na2EDTA . 00423M Na2EDTA x . 01219L = . 0000516 mol . 0000516mol/. 2499L = . 00206M hardness Titration 1 12. 23mL Na2EDTA . 00423M Na2EDTA x . 01223L = . 0000517 mol .0000517mol/. 02505L = . 00206M hardness (. 00212M+. 00206M+. 00206M)/3 = . 00208M Discussion The results are genuinely consistent however the website for checking the data is no longer valid. Provided that the titration solution was calibrated flop the results from the experiment to determine the hardness of water should be accurate with a edge of consistency between samples vs. average hardness 1. 89% at most for every of the three samples.