A. preparation of sodium hydroxide solution mass of sodium hydroxide desired (show work) 1.999 inch 0.300l co,10 m): 0,03 umalea 180 mne mass of sodium hydroxide used 1.0878g naoh b. standardization of sodium hydroxide solution (show work) balanced chemical equation: h2co + 2naoh --> na2co3 + 2h2o trial 1 trial 2 trial 3 mass of oxalic acid 0.14349 0: 15789 initial burette reading 0.25 ml 0.50m 0: 41 | final burette reading 27.63 ml 28.28 m! 31.23ml 0.14285 volume naoh added (double) moles of oxalic acid butered this data 2 ? moles of naoh added molarity of naoh average molarity 11 titration report form c. determination of unknown (show work) balanced chemical equation: unknown number no number trial 2 trial 1 trial 3 10.00 ml 10.00ml 10.00ml volume of unknown hcl titrated 1,43 ml initial burette reading 0.47 43.49 8.21 m) 49.92 44.52 final burette reading volume naoh added moles naoh added (use average molarity from part b and multiply it by the volume you added) moles hci molarity of hci average molarity actual molarity (from instructor) percentage error f unknown solution of hydrochiopil lio 0.1578 e end 31.23 m) procedure preparation of sodium hydroxide solution 0 .10m sodium hydroxide from the solid. record the mass of in a beaker prepare 300 sodium hydroxide to as many decimal places as you can. (note how the numbers on the 20 part a balance are increasing.) be sure to stir it well! 11.0879 0.300l b. standardization of sodium hydroxide sol las 1. weigh out about 0.15g of solid oxalis ad and dissolve it in about 20ml of deionized 2: 10.14390 water in an erlenmeyer flask. record the actual mass. 2. add about 5 drops of phenolphthalein to the solution 3) clean a burette and rinse it out with deionized water. with the stopcock open, run some of your sodium hydroxide solution down the inside and allow it to drain. fill your burette with your sodium hydroxide solution and record the volume. make sure there are no air bubbles, especially in the tip, volume: sta and: 27.633 m 1163 4. titrate the sodium hydroxide into the acid solution until the color changes and record the final volume. 0.1434 5 starts 5. repeat this procedure three times. lunknown c. determination of unknown 1. obtain a test tube of unknown hydrochloric acid and record the unknown number. 2 using a volumetric pipette, add 10.00ml of your unknown to an erlenmeyer flask. 3. add a few drops of phenolphthalein. 1 4. titrate with your standardized sodium hydroxide from part b recording the initial and final volumes. 5. repeat this procedure for a total of three trials. (if there is not enough unknown to do three trials of 10.00ml each, use 5ml for the last trial. obtain a 5 ml volumetric pipette for the sample.) end 28.28 mt legpur 12h dispose of your neutralized solutions in the blue waste container. dispose of the leftover acid in the yellow waste container. dispose of the leftover base in the pink waste container. 0 1,43 ml start 49.110 rogoy end: 44.52 m 30.47 ml/start 3 8.21 m/ 43.49 m) - 353m