Ph Solution

PREDICTING THE pH OF AQUEOUS SOLUTIONS OF SALTS Chemistry BC2001x Alternate method: whiz may view whatever salt as the harvest-feast of a reaction of a base with an hot MOH + HX ? HOH + MX (ionsM+ andX?) or B + HX ? BHX (ionsBH+ andX?) Generalizations about the acidulousity of the salt atomic number 18 indeed based on the properties of the parent acid and base. Observe how these statements tad to those on the previous page. 1. Salts formed from weapons-grade acids and vehement bases are unbiassed. (Aqueous solutions of neutral salts have pH = 7.00 at 25°C). Examples: NaCl; KNO3; LiClO4; CaBr2; Ba(NO3)2. [Note: this look on is guaranteed to hold save for monoprotic strong acids, not H2SO4.] 2. Salts formed from strong acids and weak bases are acidic. (Aqueous solutions of acidic salts have pH < 7.00 at 25°C). Examples: NH4Cl; NH4NO3; CH3NH3Br; C5H5NHClO4; C6H5NH3Cl; NH4HSO4. [If the strong acid is diprotic, that is, H2SO4, this rule is guaranteed to hold solitary(prenominal) if the strong acid has transferred just one proton to the weak base, that is, if the anion in the salt is HSO4?.] 3. Salts formed from strong bases and weak acids are canonical. (Aqueous solutions of canonical salts have pH > 7.00 at 25°C). Examples: KCN; NaCH3COO; K2S; Na2CO3; Ba(NO2)2; Na2SO3; Na3PO4. [If the weak acid is polyprotic, this rule always holds if the weak acid has lost any its protons to the strong base. This rule may not hold for salts containing bust protonated anions HXn?.] 4. (a)Asaltformedfromaweakacidandaweakbaseisacidicif Ka > Kb. Example: hydroxylammonium acetate (HONH3CH3COO) is acidic, because Ka(HONH3+) > Kb(CH3COO) or Ka(CH3COOH) > Kb(HONH2) . (b)Asaltformedfromaweakacidandaweakbaseisbasicif Kb > Ka. Example: ammonium cyanide (NH4CN) is basic, because Kb(CN) > Ka(NH4+) or Kb(NH3) > Ka(HCN) . (c) A salt formed from a weak acid and a weak base is neutral if Ka = Kb . Example: ammonium acetate (NH4CH3COO) is neutral, bec ause Ka(NH4+) = Kb(CH3COO) or Kb(NH3) = Ka(C! H3COOH) . 5. A salt formed from a strong base...If you want to nourish a full essay, order it on our website: OrderCustomPaper.com

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