formation of a precipitate
DESCRIPTION
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 - PowerPoint PPT PresentationTRANSCRIPT
Topic: Reactions in Aqueous Solution
Do Now: Label the following at (aq) or (s)1. NaBr2. PbNO3
3. KOH4. 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.