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Formation of a precipitate

Topic: Reactions in Aqueous Solution Do Now : Label the following at ( aq ) or (s) 1. NaBr 2. PbNO 3 3. KOH 4. CuSO 4 5. Ba 2 S. Formation of a precipitate. 2 aqueous solutions mixing to produce a new compound that is insoluble (a solid). Demo. KI + PbNO 3  KNO 3 + PbI

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Formation of a precipitate

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  1. Topic: Reactions in Aqueous SolutionDo Now: Label the following at (aq) or (s)1. NaBr2. PbNO33. KOH4. CuSO45. Ba2S

  2. Formation of a precipitate 2 aqueous solutions mixing to produce a new compound that is insoluble (a solid)

  3. Demo • KI + PbNO3 KNO3 + PbI • AgNO3 + NaCl  AgCl + NaNO3

  4. 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.

  5. 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.

  6. Lets check to see if there are really ions • Conductivity = conduct electricity • Need charged particles (ions) to travel

  7. Electrolytes • = compounds that conduct electricity • Ionic compounds that dissolve in water are electrolytes

  8. Dissolving a Covalent Substance in water split into individual moleculesNOT IONS • Ex: sucrose • C12H22O11(s)  C12H22O11(aq) • The sugar molecules are spread out among the water molecules.

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