PRS Questions: Acid-Base reactions

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Presentation transcript:

PRS Questions: Acid-Base reactions CH3CO2H(aq) + NaOH(aq)  1. CH3CO2H2+(aq) + NaO(aq) 2. CH3CO2-(aq) + H2O(l) + Na+(aq) 3. CH4(g) + CO2(g) + H2O(l)

PRS Questions: Acid-Base reactions HCN(aq) + NH3(aq)  1. NH4+(aq) + CN-(aq) 2. H2CN+(aq) + NH2-(aq) 3. C2N2(s) + 3 H2(g)

Precipitation Reactions Solubility of Ionic Compounds dissolving

To Determine Solubility: 1. identify the two ions 2. soluble ions with no “exceptions” never form precipitates 3. use listing under soluble/insoluble, but check to see if it’s an exception

Examples Soluble or Insoluble? NaNO3 FeCl3 Fe(OH)3 BaSO4 AgNO3 AgCl

More Examples Soluble or Insoluble? K3PO4 Fe3(PO4)2 PbCl2 FeSO4 (NH4)2S PbS

PRS Example 1 Which of the following is soluble? AlPO4 PbBr2 Al(OH)3 FeSO4

PRS Example 2 Which of the following is insoluble? Al(NO3)3 PbC2O4 NaOH FeF3

Precipitation Reactions Net Ionic Equations Pb(NO3)2 + K2CrO4  ? Pb(NO3)2 + KI  ?

Precipitation Reactions Net Ionic Equations Pb(NO3)2 + K2CrO4  ? Pb(NO3)2 + KI  ? BaCl2 + KNO3 

Return to Acid-Base Reactions: Find the hidden bases Thing to know: Anions of weak acids are bases. Example: CH3COOH = weak acid CH3COO- therefore = weak base HCN = weak acid CN- = weak base H3PO4 = weak acid PO43- = weak base

Return to Acid-Base Reactions: Find the hidden bases HCl + NaCN  ? HCl + AlPO4  ? HCl + CaC2O4  ?

Gas Forming Reactions 2 H+ + CO32-  CO2(g) + H2O(l) 2 H+ + SO32-  SO2(g) + H2O(l) 2 H+ + M  H2(g) + M2+(aq) M = metal, like Mg or Fe