3. Place a Petri dish under an document projector camera (preferably on a dark background) or on an overhead projector. Examples: Fe, Au, Co, Br, C, O, N, F. Ionic charges are not yet supported and will be ignored. It's probably best to drain it into a waste container of some kind before removing the demo. However, if the camera is of low quality students may not see the vivid yellow color of the precipitate. In a large lecture hall a document camera is necessary to project the image of the reaction. In this case, lead (II) nitrate, Pb(NO3)2, and sodium iodide, NaI, both soluble in water, will exist as ions in aqueous solution Pb(NO3)2 (aq] → Pb2+ (aq] +2NO− 3 (aq] Click hereto get an answer to your question ️ Section - B Q22. The solubility rules tell us that salts of group 1 (IA) metals are soluble, salts containing the nitrate anion are soluble, and salts containing the iodide anion are insoluble except for those containing the lead(II) cation (among others). Pb( NO 3) 2 (aq) + 2KI (aq) —-> Pbl 2 (s) + 2KNO 3 (aq) Pb(NO3)2 + 2KI = PbI2 +2KNO3 Wear eye protection throughout and wash hands after the demonstration. This demonstration works best if the instructor uses this demonstration as the basis of a presentation and takes about 12-15 minutes to have students do the activities that accompany this demonstration. Althou… Calculate the mass of lead (ii) iodide that should be formed. Answer.Yellow precipitate of lead iodide is formed. This experiment starts with two soluble ionic compounds: potassium iodide, and lead (II) nitrate. 1. Lead(II) nitrate reacts with potassium iodide in solution to produce the spectator species potassium nitrate, and a bright-yellow lead(II) iodide precipitate. A black precipitate of mercury(II) sulfide, HgS is produced. () What was the colour of the precipitate formed? In respect to this, what is the net ionic equation for lead ii nitrate and potassium iodide? The second page has equations only. A yellow white precipitate of silver iodide, AgI is produced. 9. (a) What is the colour of this precipitate ? Handle them with care. The other set of positive and negative ions remains in solution. (b) Write the balanced chemical equation for this reaction. Note: Exposure of silver chloride to UV light from the sun results in the decomposition of this compound. potassium is in group 1, all group 1 elements lose 1 electron to form cations with a charge of 1+ K+ The yellow one is lead iodide while the white one is potassium nitrate. Copper sulfate + potassium iodide copper iodide + potassium sulfate. () What was the colour of the precipitate formed? Note: Ag(OH)2 actually becomes Ag2O in aqueous solution. Eventually the lead ions begin to react with the iodide ions and precipitate out where they "meet" which is near the center of the Petri dish. However, if the camera is of low quality students may not see the vivid yellow color of the precipitate. Contact: Randy Sullivan, smrandy@uoregon.edu. the ions disperse in solution. Suggestion: have students:  a. predict the products from the Solubility Rules, b. write the molecular equation, c. write the full ionic equation, d. write the net ionic equation, and e. draw particle diagrams. The balanced chemical equation is Pb (NO 3) 2 + 2KI produces PbI 2 + 2K (NO) 3. Fred and Jill + Jack and Wilma  Fred and Wilma + Jack and Jill. Chemistry Department Using the tweezers, place a few crystals of each substance on opposite sides of the dish. 5. ii) balanced chemical equation. When the solutions of lead (II) nitrate and potassium iodide are mixed. Lead Nitrate Pb(NO 3) 2. Boys = (+) metallic ions and girls = (-) negative ions. The finished reaction is: 2 KCl(aq) + Pb(NO 3) 2 (aq) → 2 KNO 3 (aq) + PbCl 2 (s) The solubility rules are a useful guideline to predict whether a compound will dissolve or form a precipitate. Final Project (Andrea Tom) Type of Reaction When combined, potassium iodide and lead(II) nitrate undergo a double-displacement precipitation reaction that yields potassium nitrate and lead iodide. What is the significance of this demonstration? Potassium iodide and lead(II) nitrate are combined and undergo a double replacement reaction.Potassium iodide reacts with lead(II) nitrate and produces lead(II) iodide and potassium nitrate.The lead ions and iodide ions will eventually meet to form a yellow precipitate. A student has mixed the solutions of lead (II) nitrate and potassium iodide. Making lead(II) sulphate. Click hereto get an answer to your question ️ Section - B Q22. An orange brown precipitate of mercury(II) fluoride, HgF2 is produced. Both lead nitrate and potassium iodide are very poisonous. Whether you use the solution or the powder, you will get the same result of mixing lead nitrate and potassium iodide. The only way the solid lead(II) iodide precipitate can form in the middle of the petri dish is for 1) the Pb(NO3)2 and the KI to dissociate into ions in the water and 2) the Pb2+ ions and I- ions must migrate in the aqueous solution, i.e. (a) What is the name and colour of precipitate formed? The two charges balance in a 1:1 ratio, so potassium iodide … UO Libraries Interactive Media Group. The first page includes a precipitation practical experiment. Lead nitrate and potassium iodide should both be considered hazardous. 4. Each of the solutions is composed of positive and negative ions. A bright yellow precipitate (lead iodide) is produced from two clear solutions. Be careful when breaking down this demo. 1 1http://www.ktf-split.hr/periodni/en/abc/kpt.html. The university further disclaims all responsibility for any loss, injury, claim, liability, or damage of any kind resulting from, arising out or or any way related to (a) any errors in or omissions from this web site and the content, including but not limited to technical inaccuracies and typographical errors, or (b) your use of this web site and the information contained in this web site...the university shall not be liable for any loss, injury, claim, liability, or damage of any kind resulting from your use of the web site. Just like the above information, the result of mixing lead nitrate and potassium iodide are two new compounds. They react with each other to form a yellow precipitate of lead iodide. Please help! Jack and Jill, however, never quick make it together as an item. Lead iodide settles down at the bottom of the tube. Part of NCSSM CORE collection: This video shows the double displacement reaction of Pb(NO3)2 and KI. Potassium iodide + lead nitrate potassium nitrate + lead iodide, 2KI(aq) + Pb(NO3)2(aq) 2KNO3(aq) + PbI2(s). (ii) Name the compound precipitated. The university shall not be liable for any special, direct, indirect, incidental, or consequential damages of any kind whatsoever (including, without limitation, attorney's fees) in any way due to, resulting from, or arising in connection with the use of or inability to use the web site or the content. When a few crystals of lead nitrate and potassium iodide are added to opposite sides of a Petri dish containing deionized water, after a few minutes, a line of bright yellow lead(II) iodide precipitate forms down the middle of the dish. A blue gelatinous precipitate of copper hydroxide, Cu(OH)2is produced. Final Project (Andrea Tom) Type of Reaction When combined, potassium iodide and lead(II) nitrate undergo a double-displacement precipitation reaction that yields potassium nitrate and lead iodide. A lead nitrate solution and a sodium iodide solution react to form a precipitate of lead iodide and a sodium nitrate solution. 6. Eventually the lead ions begin to react with the iodide ions and precipitate out where they "meet" which is near the center of the Petri dish. (i) What is the colour of this precipitate? Pour enough water into the Petri dish to cover the bottom to a depth of 4-5 mm. (You do not want to do all this work if there is no reaction.) Sodium chloride + silver nitrate sodium nitrate + silver chloride, NaCl(aq) + AgNO 3 (aq) NaNO3(aq) + AgCl(s). 1) It is true. The potassium ion is K+ and the iodide ion is I− . This must be done as the chemical equation obeys the law of conservation of mass and momentum. This demonstration, with the pedagogy of having students "do the work" of predicting products, writing equations, and drawing particle level diagrams works best if it is presented AFTER the precipitation of silver chromate demonstration - which is done in a teacher directed manner. If you add colourless potassium iodide solution (or any other source of iodide ions in solution) to a solution of lead(II) nitrate, a bright yellow precipitate of lead(II) iodide is produced. Lead nitrate is also a strong oxidizing agent. When Lead Nitrate and Potassium Iodide are mixed we get Potassium Nitrate and an insoluble solid [ precipitate ] lead iodide. eg. Pb (NO 3) 2 (aq)+ 2KI (aq) → PbI 2 (s) + 2KNO 3 (aq) A student activity sheet to accompany this demonstration is available. Making lead(II) iodide. The net ionic reaction is Pb2+(aq) + 2 I-(aq) --> PbI2(s), The Kspof PbI2 is 9.8 X10-9. Plumbous Nitrate [Pb (NO3)2] Lead Nitrate. In a precipitation reaction there is an exchange of partners creating a new set of positive and negative ions. Sodium hydroxide + copper sulfate sodium sulfate + copper hydroxide, 2NaOH(aq) + CuSO4(aq) Na2SO4(aq) + Cu(OH)2(s). When a solution of lead nitrate is poored into a solution of Potassium iodide a yellow precipitate of lead iodide is formed. Potassium iodide + silver nitrate potassium nitrate + silver iodide. A bright orange precipitate of mercury iodide, PbI2 is produced. "Do not do demos unless you are an experienced chemist!" A bright yellow precipitate of lead iodide, PbI2 is produced. When lead nitrate is mix with potassium iodine, a precipitation reaction occurs and yellow precipitate of lead iodide is formed. Favourite answer. (Pouring the potassium iodide solution into the lead nitrate was a safety measure to minimize handling the lead solution as much as possible). This demonstration takes about 8 minutes to perform if you rush through it and do it is as a teacher presenting information to students. (iv) What type of reaction is this? (iii) What type of reaction is it? In chemistry, this is called a double replacement reaction. One group of these ions becomes more attracted to each other than they do to the water molecules. Note: This is an unusual reaction as the precipitate dissolves in excess iodide solution and disappears as a complex ion is formed. lead nitrate + potassium iodide -----> potassium nitrate + lead iodide. Sodium hydroxide + silver nitrate   sodium nitrate +  silver hydroxide, NaOH(aq) + AgNO3(aq) NaNO3(aq) + AgOH(s).

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