Download - Formation of a precipitate
![Page 1: Formation of a precipitate](https://reader034.vdocument.in/reader034/viewer/2022050820/56815ebf550346895dcd463a/html5/thumbnails/1.jpg)
Topic: Reactions in Aqueous Solution
Do Now: Label the following at (aq) or (s)1. NaBr2. PbNO3
3. KOH4. CuSO4
5. Ba2S
![Page 2: Formation of a precipitate](https://reader034.vdocument.in/reader034/viewer/2022050820/56815ebf550346895dcd463a/html5/thumbnails/2.jpg)
Formation of a precipitate
2 aqueous solutions mixing to produce a new compound that is
insoluble (a solid)
![Page 3: Formation of a precipitate](https://reader034.vdocument.in/reader034/viewer/2022050820/56815ebf550346895dcd463a/html5/thumbnails/3.jpg)
Demo
• KI + PbNO3 KNO3 + PbI
• AgNO3 + NaCl AgCl + NaNO3
![Page 4: Formation of a precipitate](https://reader034.vdocument.in/reader034/viewer/2022050820/56815ebf550346895dcd463a/html5/thumbnails/4.jpg)
Reactions in aqueous solution
• Many reactions, esp. many double replacement reactions, occur in water.
• What happens when substances dissolve in water?
• Depends on if they are ionic or covalent.
![Page 5: Formation of a precipitate](https://reader034.vdocument.in/reader034/viewer/2022050820/56815ebf550346895dcd463a/html5/thumbnails/5.jpg)
Dissolving an Ionic Substance in water it splits into the ions that make up
the compound• Example: • NaCl(s) Na+(aq) + Cl-(aq)• CaCl2(s) Ca2+(aq) + 2Cl-(aq)• AlCl3(s) Al3+(aq) + 3Cl-(aq)• The ions are spread out among the water molecules.
![Page 6: Formation of a precipitate](https://reader034.vdocument.in/reader034/viewer/2022050820/56815ebf550346895dcd463a/html5/thumbnails/6.jpg)
Lets check to see if there are really ions
• Conductivity = conduct electricity– Need charged particles (ions) to travel
![Page 7: Formation of a precipitate](https://reader034.vdocument.in/reader034/viewer/2022050820/56815ebf550346895dcd463a/html5/thumbnails/7.jpg)
Electrolytes
• = compounds that conduct electricity• Ionic compounds that dissolve in water are
electrolytes
![Page 8: Formation of a precipitate](https://reader034.vdocument.in/reader034/viewer/2022050820/56815ebf550346895dcd463a/html5/thumbnails/8.jpg)
Dissolving a Covalent Substance in water split into individual molecules NOT IONS
• Ex: sucrose• C12H22O11(s) C12H22O11(aq)• The sugar molecules are spread out among
the water molecules.