Question

Post-Laboratory Questions A student carried out the procedure above and consistently titrated at a relatively rapid rate for all three trials. a) Explain two possible problems that might ensue from adding the titrant too quickly. b) How would this affect reporting the concentration of the unknown?. A student carried out the above procedure in triplicate. The volume of titrant consumed varied significantly from one trial to the other (+1.00 mL). Explain how these results would affect the accuracy of the reported concentration of unknown. 3. If 0.135 g of CuCl, are dissolved in 25.00 mL of water, and titrated with 35.45 mL of Na S03 solution (of unknown concentration) to reach the end point, what mass of copper atoms is present in the sample at the end of the titration ?

do #2

Answer 1

Pog No-O Answerg Griven tRat, tRa poCadue uid aut TO studont etively ard Conistentlytitated at a three tls above apid Aat fs au is mpostont fot in smal auantattes the titsart should be odded erd point ax tha nean Sra oint afTR titsaton, eajuivaluta in volume af titsant Causes tho Switchove change Colour of tRo erd point Tis OCCuns in a of the nasow Aange af volume af tR titat adud vey t is poa?ble Quidty co lour change oddad too to mis tho exott point at hch ta Occurs (b) 1h Conlontsation of tRo unknoun is detenmined titsant oddad 3t acaidunt foom tho volune of tha -allHoe anourd of titsant is addad, oseauety oltulat foom to Volune wil be the Contantsation we esronous O ttrant Cansumed ves fon one tooil Volume tD offar by tOml) titant Consumed unleraun kroun volune f krawn unkraon oncatain

PagNo V Henaon itant Couned unknown V Let Krawn Vasml Sml Trail tittort Coneuned Hunkrown Toi 2 2u ml titoont Consumed Huntnoon 2-S Thial 3 26 ml Vtitantnued Hunenoon 25 al of untnoun ta average Now d alculat O.96t 04 3 duivation standard alculat Now L-0) C1(-ou S.O 2 O.0O4 to 0o4 foom actuwat Valu davriating we aue be duiatial by tn altusal of an numben dewiation A la lasge deuation od unknoun wiu Tha Vauatonn Consuned hove Nolume atusay wi bein unlotainity

NO-3 (5) O13 of trtsatd Cucy dioved in S,usm of Na,s03 soluction Cuclt Naso >CS,s +2 c u (63.535.x)gmol H wt of Cud 134.5 nol 63-5 glmol +2 Hou af uu otDm in Cuc Hass action Cucl 0.4721 how Fer o135 Cuc, present much nOUs of Cu atDn x 63. 8 134 O.135 0.06 57 9 CaL lQw af Consenation af mas ACsaing to tibration Has af Cuatm af at tho end