Precipitation Worksheet - Chemical Dropouts!

1 May be used for educational purposes upon acknowledgement Worksheet - Chemical Dropouts! Aprecipitationreaction is a reaction in which two solutions are mixed to produce an insoluble solidcalled a :White spotting plates anddropper M solutions ofcopper sulfate,mercury(II)nitrate,potassium chromate,potassium fluoride,potassiumiodide,sodiumchloride, sodium hydroxide,sodium sulfide,silver nitrate,Teacher:Give directions inthehandling&disposal ofchemicals according to your check withstudentswhat the precipitate is for each thereactions which is anexchangeof partners. Metalsarenamed the chemicals andwrite the(color/colour) of the hydroxide + silver nitrate Sodium nitrate + hydroxide + copper sulfate _____ + iodide + lead nitrate _____ + iodide + mercurynitrate _____ + iodide + silver nitrate _____ + chloride + silver nitrate _____ + nitrate +potassiumfluoride _____ + sulfate +potassium iodide _____ + nitrate +sodium sulfide _____ + nitrate+potassium chromate _____ + _____May be used for educational purposes upon acknowledgement Reaction WorksheetAprecipitationreaction is a reaction in which two solutions are mixed to produce an insoluble solidcalled a precipitate.

2 A simplified set of solubility rules canbe used to determine the Solubility Rules:If a compound contains one of the followingchemicals it isalways soluble AGroup Ielement. Eg. Sodium, Na+ or potassium, K+ Anammonium group, NH4+ Anitrate group, NO3- Anacetate group, CH3 COO-Student Instructions Complete theword equation for the precipitate. Write abalanced equation for each physical states(aq) = aqueous and (s) = hydroxide + silver nitrate Sodium nitrate + hydroxide + copper sulfate _____ + iodide + lead nitrate _____ + iodide + mercurynitrate _____ + iodide + silver nitrate _____ + chloride + silver nitrate _____ + nitrate +potassiumfluoride _____ + sulfate +potassium iodide _____ + nitrate +sodium sulfide _____ + nitrate+potassium chromate _____ + _____May be used for educational purposes upon acknowledgement Precipitation REACTIONS-ANSWERSD epending on theyearlevel you may or may not includethebalanced Chemical states: (s) = solid and (aq) = hydroxide + silver nitrate sodium nitrate +silver hydroxide(s)NaOH(aq) + AgNO3(aq) NaNO3(aq) + AgOH(s)The precipitate is.

3 Ag(OH)2actually becomes Ag2O in aqueous hydroxide + copper sulfate sodium sulfate + copper hydroxide(s)2 NaOH(aq) + CuSO4(aq) Na2SO4(aq) + Cu(OH)2(s)A blue gelatinousprecipitate of copper hydroxide, Cu(OH)2 is iodide + lead nitrate potassium nitrate + lead iodide(s)2KI(aq) + Pb(NO3)2(aq) 2 KNO3(aq) + PbI2(s)A bright yellow precipitate of lead iodide, PbI2 is iodide + mercury nitrate mercury iodide(s) + potassium nitrate2KI(aq) + Hg(NO3)2(aq) HgI2(s) + KNO3(aq)A bright orange precipitate ofmercury iodide, PbI2 is : This is anunusual reaction as theprecipitate dissolves in excess iodide solution and disappears as a complex ion is iodide + silver nitrate potassium nitrate + silver iodide(s)KI(aq) + AgNO3(aq) KNO3(aq) + AgI(s)Ayellowwhiteprecipitate of silver iodide, AgI is chloride + silver nitrate sodium nitrate + silver chloride(s)NaCl(aq) + AgNO3(aq) NaNO3(aq) + AgCl(s)Note: Exposure of silver chloride,AgCl to UV light from the sun results in the decomposition of thiscompound.

4 Black metallic silver is produced. 2 AgCl(s) 2Ag(s) + Cl2(g) nitrate + potassium fluoride mercury fluoride(s) + potassium nitrateHg(NO3)2(aq) + 2KF(aq) HgF2(s) + 2 KNO3(aq)An orange brown precipitate of mercury(II) fluoride, HgF2 is sulfate + potassium iodide copper iodide(s) + potassium sulfateCuSO4(aq) + 2KI(aq) CuI2(s) + K2SO4(aq)An olive green precipitate ofcopper iodide, CuI2 is nitrate + potassiumsulfide mercury fluoride(s) + potassium nitrateHg(NO3)2(aq) +K2S(aq) HgS(s) + 2 KNO3(aq)A black precipitate of mercury(II) sulfide, HgS is nitrate + potassiumchromate silver chromate(s) + potassiumnitrate2 AgNO3(aq)+K2 CrO4(aq) Ag2 CrO4(s) +2 KNO3(aq)A red-brown precipitate of silver chromate, Ag2 CrO4 is produced.