Title : Standardization of hydrochloric acid using sodium carbonate. Variables : a) dependant : ledger of hydrochloric acid. b) independant : The wring of the solution. Results : 1) Preparation of the dilute HCl. a) Rough molarities:11M b) muss in the measuring cylinder : 2 + 0.1cm³ c) volume in the volumetric flask : 250 + 0.25cm³ 2) Preparation of the Na2CO3 solution. a) Mass of pure Na2CO3 : 1.329 + 0.0001g b) Volume in the volumetric flask : 250 + 0.25 cm³ c) Volume of the pipette solution : 25 + 0.03cm³ Data collection : | |1 |2 |3 | |Initial buret reading (cm³) + | | | | |0.05cm³ |0.00 |0.00 |0.00 | |Final buret reading (cm³) + | | | | |0.05cm³ |20.7 |20.6 |20.
2 | |Volume of HCl used (cm³) + | ! | | | |0.05cm³ |20.7 |20.6 |20.2 | Observation : The colour power in the Na2CO3 solution changes from yellow to orange. Data bear upon : consummate(a) volume of HCl used : 20.7 + 20.6 + 20.2 = 20.5 cm³ + 0.05 cm³. 3 irresolution : | 20.5-20.7 | + | 20.5-20.6 | + | 20.5-20.2 | x 100 = 2.9% 20.5 Gross volume of HCl used with percent of distrust = 20.50 cm³ + 2.9% cm³. The molarities of HCl after dilution : M1V1 = M2V2...If you want to wee-wee a full essay, order it on our website:
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