Acids and Bases – Salt Solutions Worksheet KEY Salts of monoprotic acids/bases: For each compound, determine which of the ions will be the important one to evaluate (not a spectator); identify the conjugate and assign a class for the conjugate. Then –predict the acid/base behavior of the ion from the salt based on what its conjugate is. Conjugates to strong acids DO NOT react with water Conjugates to weak acids are weak bases Conjugates to weak bases are weak acids “Salt” Compound NaNO3 Ion to evaluate is? NO3- Conjugate to ion is? HNO3 Conjugate is weak/strong? acid/base? strong acid Sodium salt solution will be? neutral NaCN CN- HCN weak acid basic NaF F- HF weak acid basic HCO2Na HCO2- HCO2H weak acid basic NaC2H3O2 C 2 H 3 O2 - HC2H3O2 weak acid basic NaCl HCl NH3 strong acid basic NH4Cl ClNH4+ weak base acidic C6H5CO2Na C6H5CO2- C6H5CO2H weak acid basic NaNO2 NO2- HNO2 weak acid basic NaOCl OCl- HOCl weak acid basic Salts of polyprotic acids/bases: For each compound, determine which of the ions will be the important one to evaluate (not a spectator); Identify whether the ion is a ‘tweener” or a terminal ion. Predict whether the salt solution will be acidic, neutral, or basic The terminal ion in a series is always basic (no protons to donate) If the Ka for the tweener is > 1 x 10-8 the acid behavior will win If the Ka for the tweener is < 1 x 10-8 the basic behavior will win “Salt” Compound NaHSO3 Ion to evaluate is? HSO3- terminal or tweener tweener NaH2PO4 H2PO4- Na2CO3 tweener Ka Sodium salt solution will be? 1.0 x 10-7 acidic tweener 6.2 x 10-8 acidic CO3-2 terminal N/A basic Na2SO4 SO4-2 terminal N/A basic Na2SO3 SO3-2 HPO4- terminal N/A basic Na2HPO4 tweener 2.2 x 10-13 basic NaHCO3 HCO3- tweener 5.6 x 10-11 basic Na3PO4 PO43- terminal N/A basic NaHSO4 HSO4- tweener 1.2 x 10-2 acidic

Acid Base Salts Solutions Key

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