Ph Solution

PREDICTING THE pH OF AQUEOUS SOLUTIONS OF SALTS Chemistry BC2001x Alternate method: superstar 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 acrimoniousity of the salt are thus based on the properties of the parent acid and base. Observe how these statements dye to those on the previous page. 1. Salts formed from weapons-grade acids and hard bases are deaf(p). (Aqueous solutions of neutral salts have pH = 7.00 at 25°C). Examples: NaCl; KNO3; LiClO4; CaBr2; Ba(NO3)2. [Note: this continue 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 single if t he 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 prefatorial 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 wear out protonated anions HXn?.] 4. (a)Asaltformedfromaweakacidandaweakbaseisacidicif Ka > Kb. Example: hydroxyl ammonium ion acetate (HONH3CH3COO) is acidic, because Ka(HONH3+) > Kb(CH3COO) or Ka(CH3COOH) > Kb(HONH2) . ( b)Asaltformedfromaweakacidandaweakbaseisbasi! cif 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, because Ka(NH4+) = Kb(CH3COO) or Kb(NH3) = Ka(CH3COOH) . 5. A salt formed from a strong base...If you want to have a full essay, order it on our website: OrderEssay.net

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