Construction of an improvised electrolysis apparatus 2Presentation Transcript
University of the PhilippinesNational Institute for Science and Mathematics Education (UPNISMED)*This is one of the activities developed by UPNISMED as part of the Science and Mathematics Education Manpower Development Project (SMEMDP).
What you will need glue ruler alcohol lamp/safety matches stripping knife dry cells (1.5 V) 2 paper clips (bulldog type) 3 disposable syringes (10 mL) 2 stainless steel screws # 6 (2 x 12) 2 connecting wires (red and black) iron nail (about 6 cm) plastic bottle (1 L, 8 cm in diameter or more ), preferably thick and hard hard plastic straw or dextrose plastic tube (6 cm long)
Remove each of the plungersfrom the two disposable 10 mLsyringes.Attach the two syringes at thebase by heating it in an alcohollamp.
Insert each tip of the syringe inside a plastic straw.Bend the straw to close itusing a bulldog typepaper clip. “electrolysis syringes”
Divide the plastic bottle into 3 1portions by marking “cutting 2 6 cmlines” around the bottle. 3 5 cmUse the following distance between cutting-line marks: Bottom portion:about 5 Middle portion: about 6 cm from cm from the bottom part of the marked line of the bottom the bottle. This will serve portion. This will serve as the as the sample container. electrolysis apparatus stand.
Using pre-heated stripping knife, cutthe bottle along the marking lines.Use the middle portion of the bottleas a stand for the container.Make two small squares measuring2 cm x 2 cm at opposite sides of thebase. These will serve as passageway for the connecting wires.
Measure the distance between the centers of the “electrolysis syringes”. Mark this length with a line on the bottom of the cup.Using a hot GI wire/nail(2 mm in diameter),bore a small hole at eachend of the line.
Insert the stainless screwthrough each hole by rotating itcarefully until 1/4 of the nail isout at the bottom of the bottle.Apply glue around thestainless screws at the bottompart of the container toprevent leaks. Note: The glue should only be applied on the outside surface of the container.
Support the sample container usingthe electrolysis apparatus stand.Invert the “electrolysis syringes”over the stainless screws.
Connect the wires (red and black)to each stainless screw at thebottom of the container.Connect the red wire to positive(+) terminal of the dry cell.Connect the black wire to negative(-) terminal of the dry cell.
sample container electrolysis syringes Attached to the Attached to the stainless screw stainless screw Connect black Connect red wire to negative wire to positive (-) terminal of (+) terminal of the dry cell. the dry cell. The complete set-up of an improvised electrolysis apparatusReference: Philippines. National Institute for Science and Mathematics Education Development.(2001). Practical work in high school chemistry: Sourcebook for teachers. Quezon City: Author
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