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(7Sm 19.1AL 14.5L Clininelee o-35F L Acid/Base Titration SCH3U Procedure 1) Write down the number of your unknown solution!!!!6 2) Pipette Sml ofo.5 M bydrochloric acid into an Erlenmeyer flask. Add 2-3 drops of phenolphthalein indicator 3) Set up a retort stand, burette clamp, burette, and funnel. Rinse the burette with distilled water Then rinse it with sodium hydroxide 4) When you are done cleaning vour burette, fill the burette with the sodium hydroxide ('Make sure there are no air bubbles in the burette) 5) Titrate the sodium hydroxide into the Erlenmeeyer flask (O.5ml at a time) while swarling the contents. Continue this process until you reach the end point (vou should notice a color change) 6) Repeat steps 1, and 4 twice (for a total of three trials, and make sure that all three trials are within 0.2ml of each other) " Your second and third trial should be done more accurately, and make sure the Frlenmeyer flask is dry before doing other trials Make sure not to add the sodium hydroxide in too fast because you will miss the end point As soon as the complete solution changes color, stop the titration. Someone should always be swirling the solution as it is reacting Calculations a) Average the two closest burette readings. Average all three readings if they agree within about +0.2mL b) Calculate the concentration of sodium hydroxide. ke the average volume Find the molar mass of sodiutm hydroxide, and then calculate the mass of base in the volume used 4) Senor Cobtain the actual concentration from the teacher) Discussion Chemical equation for the neutralization reaction What was the concentration you obtained from calculations What was the actual concentration What was your percent enor Poswble sources of error (make sure these are based on your error) Descriptive Fendbr MATERIALS AND APPARATUS tors und Are the m Are the units plaond in the subbeading Are the obsenatons place into a sclentific tablel Does yeur talle Have a title k the titie anderined sit an appropriate title that identifies what is tn the table the table boxed Did you use a ruler to trake the tablel tsthebetup of the table eany to followh Was there a sampie caleulation shown for nach calclation completed in tha labl Average volume Concentration of NaOH BSERVATIONS CALCULATIONS OMassof NaoH se s the math work properiy formatted and easy to follcw sthe math work accuate The balance Did vou ANALYSS AND DISCUSSION the concentration obtaibed fiom the t to the actual ooncentration epenme sit witten in ap Have tdentifief and explained any possible sources of errorl Do tie sources of enor identilied make sense and are related to the concentration obtaihed Your report is organized and written so that it flows and masts sense OYou used different tvpes of transition CFor example or "in addition etc.) lab report witten a1a formal document (does not ndude your opinion or the use of fist person (1 and we) You have sed your scientfic vocabulary corectly You have no encn in gramimar or speing (this means you edited and proofead) CDEyou follow a safety procedures Dd you Dd you cleanup your ab station WRITTEN MMNEATION AFTY he procedure and folowing it properly te in the experitment each section, a minimum mark given would be a level 4- ctations and have included thoroughnes in each section to get Thing an Communiation Mark

Answer 1

y pipet Sour les ofeuor y either you addleel extsa auid yoy Aun more base Faom buret to a darle pinfe colous Chemical eqd' Balanced # . Nacl (aq.) Hy0 (ag.) HCl (a9.) + NaOH (ag.) > Vol1 given ty you fAr trinls Na 0H used as - 17.8Ml 18.1 mL 2 (4.5 mL-eliminated 3 - Aisst your experiment fix Wreng as your COsmect experiment last two shoyld Le endinga exactly Readirgs 179t/2.1 As per your data, lets tafee average af thase tevo So volume aNaoH used for Sm! of 0-5M HU is : 17.95 ml. the calcalation neamality equ. fome Oni); Now fA ton(. NaOH Ms V Base) Na0 H My, (acid) He al0.5M Sm MX 17.95ML M, (NGOH) #Hente caleulated molauity (onc) 0.5XS 0.14 M (0.139) 7.95 NaOH O.14 M # As per your dufa autual nr. is 0.338 O.338M given f Jodiuna Hydroride; 3+16+1 (NaoH) Molar mas No.f moles Vol in titke No. fmoles Palasity X1000 moles No. 0.14M X 0. O1795 -0.0 OS13males Molar man Naot und = Mars mclaL maiy So, man NaoH ased- 0.000513 x40 0.10052 o.1yM-0.338n x I00 abserved cone-taue tonc S8.58% Urdr esror c.338m teye (one