link StrengthIntroduction Again

All acids and bases execute not ionize or dissociate to the same extent. This leader to the statement the acids and bases space not all of equal strength in developing H+ and also OH- ion in solution. The terms "strong" and also "weak" offer an indication of the toughness of an acid or base. The terms solid and weak describe the capacity of acid and base services to conduct electricity. If the acid or basic conducts electrical power strongly, it is a strong acid or base. If the mountain or base conducts electrical power weakly, the is a weak acid or base.

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Demonstration the Acid and also Base Conductivity

The instructor will test the conductivity of various solutions v a light pear apparatus. The light pear circuit is incomplete. If the circuit is perfect by a systems containing a large number of ions, the light bulb will glow brightly describe a solid ability come conduct electrical energy as presented for HCl. If the circuit is completed by a solution containing big numbers of molecules and also either no ion or couple of ions, the equipment does not conduct or conducts really weakly as shown for acetic acid.


Ka = /

where HA is the concentration of the acid at equilibrium, and A- is the concentration that its conjugate base at equilibrium and also for bases the expression will certainly be


where B is the concentration that the base at equilibrium and also HB+ is the concentration of its conjugate acid at equilibrium

The more powerful an acid is, the lower the pH the will produce in solution. PH is calculated by acquisition the an unfavorable logarithm the the concentration the hydronium ions. For strong acids, you have the right to calculate the pH by simply taking the an adverse logarithm of its molarity as it completely dissociates into its conjugate base and also hydronium. The very same goes for solid bases, other than the negative logarithm provides you the pOH as opposed to the pH. Because that weak acids and also bases, the greater the Ka or Kb, the an ext acidic or an easy the solution. To find the pH for a weak acid or base, you must use the K equation and also a RICE table to identify the pH.

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All acids have a conjugate basic that develops when castle react v water, and similarly, every bases have actually a conjugate acid that reacts when they kind with water.1 You can judge the relative strength the a conjugate by the \(K_a\) or \(K_b\) value of the substance since \(K_a \timesK_b\) is same to the ionization continuous of water, Kw i beg your pardon is equal to \(1 \times 10^-14\) in ~ room temperature. The greater the Ka, the more powerful the acid is, and also the weaker its conjugate basic is. Similarly, the greater the Kb, the more powerful the substance is as a base, and the an ext weakly acidic the conjugate acid is.1

Calculation the Ka

For an acid that reacts through water in the reaction



where each bracketed term to represent the concentration of that substance in solution.

Relation that Kw, Kb, Ka


Partial perform of solid Acids: Hydrochlroic acid (HCl), Nitric mountain (HNO3), Perchloric mountain (HClO4), Sulfuric acid (H2SO4)

Partial perform of strong Bases: salt Hydroxide (NaOH), Barium Hydroxide (Ba(OH)2), Calcium Hydroxide (Ca(OH)2), Lithium Hydroxide (LiOH) (Hydroxides of team I and also II elements are generally strong bases)

Partial perform of Weak Acids: Acetic mountain (CH3COOH), Carbonic mountain (H2CO3), Phosphoric mountain (H3PO4)

Partial list of Weak Bases: Ammonia (NH3), Calcium lead carbonate (CaCO3), sodium Acetate (NaCH3COO)