[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"doc-detail-207964-en":3,"doc-seo-207964-105":30,"detail-sidebar-cat-0-en-105":90},{"code":4,"msg":5,"data":6},0,"success",{"doc_id":7,"user_id":8,"nickname":9,"user_avatar":10,"doc_module":4,"category_id":11,"category_name":12,"doc_title":13,"doc_description":14,"doc_content":15,"file_id":16,"file_url":17,"file_type":18,"file_size":19,"view_count":20,"is_deleted":4,"is_public":20,"is_downloadable":20,"audit_status":20,"page_count":21,"language":22,"language_code":23,"site_id":24,"html_lang":23,"table_of_contents":25,"faqs":26,"seo_title":27,"seo_description":14,"update_tm":28,"read_time":29},207964,962084925502,"Emma Mercer","https://ap-avatar.wpscdn.com/davatar_6f874abed73319feea01a86fa6f0fab8",4,"Exam","Electrolysis - GCSE Chemistry Required Practical Activity","GCSE Chemistry required practical activity on electrolysis, guiding students to investigate the elements formed at positive (anode) and negative (cathode) electrodes when passing current through different salt solutions. Learners use a low-voltage power supply with carbon rod electrodes to observe bubbling patterns and changes to blue litmus paper. Results are recorded for copper(II) chloride, copper(II) sulfate, sodium chloride, and sodium sulfate, including evidence of metal coating formation on the cathode and safety-focused risk assessment.","GCSE Chemistry required practical activity: Electrolysis  \nStudent sheet  \nInvestigating the elements formed at each electrode when different salt solutions are electrolysed  \nYou will use a low voltage power supply and carbon rod electrodes to pass a current through four different salt solutions. You will identify the element formed at the positive and negative electrode in each case. Risk assessment  \n􀁸 Safety goggles should be worn throughout.  \nMethod  \nYou are provided with the following:  \n􀁸 copper (II) chloride solution  \n􀁸 copper (II) sulfate solution  \n􀁸 sodium chloride solution  \n􀁸 sodium sulfate solution  \n􀁸 100 cm3 beaker  \n􀁸 petri dish lid  \n􀁸 two carbon rod electrodes  \n􀁸 two crocodile/4 mm plug leads  \n􀁸 low voltage power supply  \n􀁸 blue litmus paper  \n􀁸 tweezers.  \nRead these instructions carefully before you start work.  \n1. Pour copper (II) chloride solution into the beaker to about 50 cm3.  \n2. Add the lid and insert carbon rods through the holes. The rods must not touch each other.  \nAttach crocodile leads to the rods. Connect the rods to the dc (red and black) terminals of a low voltage power supply.  \n3. Select 4 V on the power supply and switch on.  \n4. Look at both electrodes. Is there bubbling at neither, one or both electrodes?  \n5. Use tweezers to hold a piece of blue litmus paper in the solution next to the positive electrode (the one connected to the red terminal) . You will need to lift the lid temporarily to do this.  \nWrite your observations in the first blank row of the table below. What is this element?  \n\n| Solution | Positive electrode (anode) |  | Negative electrode (cathode) |  |\n| --- | --- | --- | --- | --- |\n|  | Observations | Element formed | Observations | Element formed |\n| Copper (II)\u003Cbr>chloride | Bubbles produced Turns litmus paper white (bleaches) |  | Solution loses its blue colour\u003Cbr>A thin metallic cover formed on the electrode |  |\n| Copper (II)\u003Cbr>sulfate | Bubbles produced Litmus paper stays blue |  | Solution loses its blue colour\u003Cbr>A thin metallic cover formed on the electrode |  |\n| Sodium\u003Cbr>chloride | Bubbles produced Turns litmus paper white (bleaches) |  | Bubbles produced |  |\n| Sodium\u003Cbr>sulfate | Bubbles produced Litmus paper stays blue |  | Bubbles produced |  |\n\n6. After no more than five minutes, switch off the power supply. Examine the negative electrode (the one connected to the black terminal) . Is there evidence of a metal coating on it? What could it be? Record your results in the table.  \n7. Clean the equipment carefully. Repeat steps 1‒6 using solutions of:  \n􀁸 copper (II) sulfate  \n􀁸 sodium chloride  \n􀁸 sodium sulfate.  \nAdditional information  \nGas produced at the positive electrode which does not bleach blue litmus paper, is oxygen. The amounts produced are usually too small to identify by testing.  \nIf a gas is produced at the negative electrode, it is hydrogen. The amounts produced are usually too small to identify by testing.","cbCairTtcEYq1ZKI","https://ap.wps.com/l/cbCairTtcEYq1ZKI","pdf",289694,1,2,"English","en",105,"# Investigating elements formed during electrolysis\n## Apparatus and safety\n## Method and observations for each salt solution\n## Additional information on gases","[{\"question\":\"What solutions are tested in this electrolysis practical?\",\"answer\":\"The practical uses copper(II) chloride, copper(II) sulfate, sodium chloride, and sodium sulfate solutions.\"},{\"question\":\"How do you determine what happens at the anode and cathode?\",\"answer\":\"Observe bubbling at both electrodes and test the solution next to the positive electrode using blue litmus paper to see whether it bleaches.\"},{\"question\":\"What gases can form at the positive and negative electrodes?\",\"answer\":\"A gas at the positive electrode that does not bleach blue litmus paper is oxygen, and a gas at the negative electrode is hydrogen; amounts are usually too small to identify by testing.\"}]","Electrolysis - GCSE Chemistry Required Practical Activity | PDF",1788601927,5,{"code":4,"msg":31,"data":32},"ok",{"site_id":24,"language":23,"slug":33,"title":13,"keywords":34,"description":14,"schema_data":35,"social_meta":85,"head_meta":87,"extra_data":89,"updated_unix":28},"electrolysis-gcse-chemistry-required-practical-activity","",{"@graph":36,"@context":84},[37,52,67],{"@type":38,"itemListElement":39},"BreadcrumbList",[40,44,47,50],{"item":41,"name":42,"@type":43,"position":20},"https://docshare.wps.com","Home","ListItem",{"item":45,"name":46,"@type":43,"position":21},"https://docshare.wps.com/document/","Document",{"item":48,"name":12,"@type":43,"position":49},"https://docshare.wps.com/document/exam/",3,{"item":51,"name":13,"@type":43,"position":11},"https://docshare.wps.com/document/electrolysis-gcse-chemistry-required-practical-activity/207964/",{"url":51,"name":13,"@type":53,"author":54,"headline":13,"publisher":56,"fileFormat":59,"inLanguage":23,"description":14,"dateModified":60,"datePublished":61,"encodingFormat":59,"isAccessibleForFree":62,"interactionStatistic":63},"DigitalDocument",{"name":9,"@type":55},"Person",{"url":41,"name":57,"@type":58},"DocShare","Organization","application/pdf","2026-09-06","2026-09-05",true,{"@type":64,"interactionType":65,"userInteractionCount":20},"InteractionCounter",{"@type":66},"ViewAction",{"@type":68,"mainEntity":69},"FAQPage",[70,76,80],{"name":71,"@type":72,"acceptedAnswer":73},"What solutions are tested in this electrolysis practical?","Question",{"text":74,"@type":75},"The practical uses copper(II) chloride, copper(II) sulfate, sodium chloride, and sodium sulfate solutions.","Answer",{"name":77,"@type":72,"acceptedAnswer":78},"How do you determine what happens at the anode and cathode?",{"text":79,"@type":75},"Observe bubbling at both electrodes and test the solution next to the positive electrode using blue litmus paper to see whether it bleaches.",{"name":81,"@type":72,"acceptedAnswer":82},"What gases can form at the positive and negative electrodes?",{"text":83,"@type":75},"A gas at the positive electrode that does not bleach blue litmus paper is oxygen, and a gas at the negative electrode is hydrogen; amounts are usually too small to identify by testing.","https://schema.org",{"og:url":51,"og:type":86,"og:title":13,"og:site_name":57,"og:description":14},"article",{"robots":88,"canonical":51},"index,follow",{"doc_id":7,"site_id":24},{"code":4,"msg":5,"data":91},[92,96,100,103,107,112,117,122,127,130,134],{"id":20,"doc_module":4,"doc_module_name":46,"category_name":93,"show_sort_weight":94,"slug":95},"Story & Novel",90,"story-novel",{"id":21,"doc_module":4,"doc_module_name":46,"category_name":97,"show_sort_weight":98,"slug":99},"Literature",80,"literature",{"id":11,"doc_module":4,"doc_module_name":46,"category_name":12,"show_sort_weight":101,"slug":102},70,"exam",{"id":29,"doc_module":4,"doc_module_name":46,"category_name":104,"show_sort_weight":105,"slug":106},"Comic",60,"comic",{"id":108,"doc_module":4,"doc_module_name":46,"category_name":109,"show_sort_weight":110,"slug":111},6,"Technology",50,"technology",{"id":113,"doc_module":4,"doc_module_name":46,"category_name":114,"show_sort_weight":115,"slug":116},7,"Healthcare",40,"healthcare",{"id":118,"doc_module":4,"doc_module_name":46,"category_name":119,"show_sort_weight":120,"slug":121},8,"Research & Report",30,"research-report",{"id":123,"doc_module":4,"doc_module_name":46,"category_name":124,"show_sort_weight":125,"slug":126},9,"Religion & Spirituality",20,"religion-spirituality",{"id":125,"doc_module":4,"doc_module_name":46,"category_name":128,"show_sort_weight":125,"slug":129},"World Cup","world-cup",{"id":131,"doc_module":4,"doc_module_name":46,"category_name":132,"show_sort_weight":131,"slug":133},10,"Lifestyle","lifestyle",{"id":135,"doc_module":4,"doc_module_name":46,"category_name":136,"show_sort_weight":29,"slug":137},19,"General","general"]