Solubility Rules and Precipitation Reactions. Not all ionic compounds dissolve! Instead of doing experiments all the time to see which ones will dissolve,

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Presentation transcript:

Solubility Rules and Precipitation Reactions

Not all ionic compounds dissolve! Instead of doing experiments all the time to see which ones will dissolve, we use The solubility rules.

Solubility Rules 1.All nitrates (NO 3 - ) are soluble. 2.All ammonium (NH 4 + ) or alkali (Li +, Na +, K +, Rb +, Cs +, Fr + ) compounds are soluble. 3.All carbonates (CO 3 2- ), phosphates (PO ) and hydroxides (OH - ) are insoluble except with the cations in Rule #2. 4. All chlorides (Cl - ), bromides (Br - ), and iodides (I - ), are soluble except with Ag +, Pb 2+, or Hg All sulphates (SO 4 2- ) are soluble except with Ca 2+, Sr 2+, Ba 2+, Ra 2+, Pb 2+,

Which of the following are soluble in water? a.SrSO 4 b.NaNO 3 c.PbCl 2 Not soluble soluble Not soluble

Precipitation Reactions When a solid doesn’t dissolve it is called insoluble. A solid that forms when two solutions are mixed is called a precipitate.

Predict the products of the following reaction: (if no solid precipitate is formed, there is no reaction) Pb(NO 3 ) 2 (aq) + KI (aq)  Pb(NO 3 ) 2 (aq) + 2KI (aq)  PbI 2 (s) + 2KNO 3 (aq) We know it is a solid precipitate because it is insoluble according to the solubility rules.

A picture of the reaction: Pb 2+ NO 3 - Because K + and NO 3 - remain dissolved, they are called spectator ions and are not included in the net ionic equation. Net Ionic Equation Pb 2+ (aq) + 2I - (aq)  PbI 2 (s) NO 3 - K+K+ I-I- K+K+ PbI 2(s)

Net Ionic Equation Write the balanced chemical and net ionic equation for: Na 2 CO 3 (aq) + CaCl 2 (aq)  Step 1: Write the balanced chemical equation Na 2 CO 3 (aq) + CaCl 2 (aq)  CaCO 3 (s) + 2NaCl (aq) Step 2: Remove the spectator ions (those that are soluble). Ca 2+ (aq) + CO 3 2- (aq)  CaCO 3 (s) Insoluble precipitate