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1 Using digital badges fr develping high-schl chemistry labratry skills Nami Hennah and Michael K. Seery 1. Nrthamptn Schl fr Bys, Billing Rd, Nrthamptn NN1 5RT, UK. 2. EaStCHEM Schl f Chemistry, University f Edinburgh, Jseph Black Building, Edinburgh, UK. Supplementary Infrmatin: Peer review sheets fr: (1) Standard Slutin Prcedure (2) Pipetting Prcedure (3) Titratin Prcedure Cmpetency Requirement Details fr each badge (infrmatin added t badge metadata in (1) Standard Slutin (2) Pipetting (3) Titratin

2 Standard Slutin Prcedure Review Sheet Name: Partners Name: Instructins: Use the spaces t highlight relevant pints and ask yur partner ffer sme helpful feedback when reviewing the technique. Prtcl Step Yur Cmments / Feedback Lab Partner Weighing ut slid sdium carbnate int weigh bat T check: clean balance, tare the balance with the weigh bat,, tidy wrking, final mass clse t required value. Transferring slid t beaker T check: adding slid frm weigh bat and washing weigh bat int beaker, aid disslving with glass rd, washing glass rd, taking care nt t exceed final desired vlume. Transfer t vlumetric flask T check: transfer f slutin, raising the funnel, washing f beaker and bringing final vlume clse t mark. Making up t the mark T check: careful additin f water drpwise using a plastic pipette, bttm f meniscus exactly n graduatin line. Stppering and inverting slutin. Adding a label with apprpriate details. If the liquid level ges abve the meniscus, the slutin shuld be discarded and the prcedure restarted.

3 Pipetting Prcedure Review Sheet Name: Partners Name: Instructins: Use the spaces t highlight relevant pints and ask yur partner ffer sme helpful feedback when reviewing the technique. Prtcl Step Yur Cmments / Feedback Lab Partner 1 2 Cllect the necessary glassware and ensure it is clean T check: washing f glassware with water and small amunts f slutin. Drying ff any drps. Pipette 25 cm 3 vinegar int 250 cm 3 vlumetric flask r cnical flask T check: filler is depressed prir t attaching t pipette; attaching with hands clse tgether; drawing up liquid int pipette but nt int filler; remve filler with index finger ver the end f the pipette, lwering t the line; releasing liquid while hlding pipette vertically, tuch last drp t surface f slutin.

4 Titratins Prcedure Review Sheet Name: Partners Name: Instructins Use the frm belw t assess yur lab partner while they carry ut a technique. Recrd the steps indicated n their phne s they can submit their vide fr assessment. Use the spaces t ffer sme helpful feedback when reviewing the technique. Submit this frm t yur demnstratr at the end f the lab. Prtcl Step Yur Cmments / Feedback Lab Partner Cllect the necessary glassware and ensure it is clean T check: washing f glassware with water and small amunts f slutin. Drying ff any drps. Pipette 25 cm 3 ~0.1mldm -3 sdium carbnate standard slutin int flask T check: filler is depressed prir t attaching t pipette; attaching with hands clse tgether; drawing up liquid int pipette but nt int filler; remve filler with index finger ver the end f the pipette, lwering t the line; releasing liquid while hlding pipette vertically, tuch last drp t surface f slutin. Adding ~ 0.05 and 0.15 ml dm 3 sulfuric acid, t the burette Begin videing the demnstratin at this pint T check: hlding funnel abve burette, d nt add t zer mark, remving funnel. Stating initial vlume f liquid (camera zm) T check: clear picture f initial value and stating reading t tw decimal places Adding indicatr and beginning titratin T check: adding 2 3 drps nly methyl range, presence f white tile, adding titrant while shaking flask, nting rate f clur change. Adding liquid drpwise twards end pint T check: adding drpwise, washing burette tip and sides f flask with small amunts f water, successfully reaching endpint. Stating final vlume f liquid (camera zm) and nte n sheet T check: clear picture f final value and stating reading t tw decimal places; stating titratin vlume. End videing the demnstratin at this pint

5 Title A level Lab Skill: preparing standard slutins Descriptin T have been awarded this badge yu must have successfully cmpleted the prcess utlined belw: Cmplete the pre-lab questins based upn the vide Carry ut the prcedure and with a partner, take turns t using yur phnes t recrd each ther cmpleting the steps identified belw. Successfully cmplete the calculatin fr yur slutin giving a final cncentratin t the apprpriate degree f accuracy and answer the fllw up questins. Watch the vide f yur technique and use the sheet prvided belw t assess yurself when watching the vide. Ask yur partner t review the vide and add their cmments t the sheet. Criteria Cllect the necessary glassware and ensure it is clean including washing f glassware with water and small amunts f slutin. Drying ff any drps. Weighing ut slid int weigh bat: Adding slid frm cntainer t beaker while n tissue, mving t balance t weigh, tidy wrking, final mass clse t required value. Transferring slid t beaker: Adding slid frm weigh bat and washing weigh bat int beaker, aid disslving with glass rd, washing glass rd, taking care nt t exceed final desired vlume. Transfer t vlumetric flask: Transfer f slutin, washing f beaker and bringing final vlume clse t mark. Making up t the mark Careful additin f water drpwise using a plastic pipette, bttm f meniscus exactly n graduatin line. Stppering and inverting slutin Title A level lab skill: pipetting Descriptin T have been awarded this badge yu must have successfully cmpleted the prcess utlined belw: Cmplete the pre-lab questins based upn the vide

6 Carry ut the prcedure and with a partner take turns t using yur phnes t recrd each ther cmpleting the steps identified belw. Successfully cmplete the calculatin fr yur final slutin giving a final cncentratin t the apprpriate degree f accuracy and answer the fllw up questins. Watch the vide f yur technique and use the sheet prvided belw t assess yurself when watching the vide. Ask yur partner t review the vide and add their cmments t the sheet. Criteria Cllect the necessary glassware and ensure it is clean including washing f glassware with water and small amunts f slutin. Drying ff any drps. Pipette 25 cm 3 stck slutin int 250 cm 3 vlumetric flask Including these pints: filler is depressed prir t attaching t pipette; attaching with hands clse tgether; drawing up liquid int pipette but nt int filler; remve filler with index finger ver the end f the pipette, lwering t the line; releasing liquid while hlding pipette vertically, tuch last drp t surface f slutin.

7 Title A level lab skill: titrating Descriptin T have been awarded this badge yu must have successfully cmpleted the prcess utlined belw: Cmplete the pre-lab questins based upn the vide Carry ut the prcedure and with a partner, take turns t using yur phnes t recrd each ther cmpleting the steps identified belw. Identify and use cncrdant titres t successfully cmplete the titratin calculatin giving a final cncentratin t the apprpriate degree f accuracy and answer the fllw up questins. Watch the vide f yur technique and use the sheet prvided belw t assess yurself when watching the vide. Ask yur partner t review the vide and add their cmments t the sheet. Criteria Cllect the necessary glassware and ensure it is clean, including, washing f glassware with water and small amunts f slutin. Drying ff any drps. Pipette 25 cm 3 ~0.1mldm 3 sdium carbnate standard slutin int flask Including the fllwing check filler is depressed prir t attaching t pipette; attaching with hands clse tgether; drawing up liquid int pipette but nt int filler; remve filler with index finger ver the end f the pipette, lwering t the line; releasing liquid while hlding pipette vertically, tuch last drp t surface f slutin. Adding ~ 0.05 and 0.15 ml dm 3 sulfuric acid t the burette Including: hlding funnel abve burette, d nt add t zer mark, remving funnel and checking fr air bubbles belw the tap. Stating initial vlume f liquid Recrding the stating reading t tw decimal places. Adding indicatr and beginning titratin Adding 2 3 drps nly methyl range, presence f white tile, adding titrant while shaking flask, nting rate f clur change. Adding liquid drpwise twards end pint Including: adding drpwise, washing burette tip and sides f flask with small amunts f water, successfully reaching end-pint. Stating final vlume f liquid Recrd final value t tw decimal places and calculate the titre. Cmplete a rugh titratin fllwed accurate titratins t prduce tw cncrdant results n further than 0.1 cm 3 apart.

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