Understanding Reactions in Aqueous Solutions
Explore the reactions in aqueous solutions, including the formation of precipitates and the behavior of ionic and covalent substances when dissolved in water. Learn about electrolytes, conductivity, and how compounds split into ions or molecules.
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Presentation Transcript
Topic: Reactions in Aqueous Solution Do Now: Label the following at (aq) or (s) 1. NaBr 2. PbNO3 3. KOH 4. CuSO4 5. Ba2S
Formation of a precipitate 2 aqueous solutions mixing to produce a new compound that is insoluble (a solid)
Demo KI + PbNO3 KNO3 + PbI AgNO3 + NaCl AgCl + NaNO3
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.
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.
Lets check to see if there are really ions Conductivity = conduct electricity Need charged particles (ions) to travel
Electrolytes = compounds that conduct electricity Ionic compounds that dissolve in water are electrolytes
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.
