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)

Acid-Base reactions

HCN(aq) + NH3(aq)

1. NH4+(aq) + CN-(aq)

2. H2CN+(aq) + NH2-(aq)

3. C2N2(s) + 3 H2(g)

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 ?

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?

1. NaNO3

2. FeCl33. Fe(OH)3

4. BaSO4

5. AgNO3

6. AgCl

More Examples

Soluble or Insoluble?

1. K3PO4

2. Fe3(PO4)2

3. PbCl24. FeSO4

5. (NH4)2S6. PbS

PRS Example 1

Which of the following is soluble?

1. AlPO4

2. PbBr2

3. Al(OH)3

4. FeSO4

PRS Example 2

Which of the following is insoluble?

1. Al(NO3)3

2. PbC2O4

3. NaOH

4. FeF3

Precipitation ReactionsNet Ionic Equations

Pb(NO3)2 + K2CrO4 ?

Pb(NO3)2 + KI ?

BaCl2 + KNO3

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