We've already talked about why the hydroxide ion is a strong nucleophile, and we notice from experience that hydroxide is a strong base. So something like sodium hydroxide is used all the time in general chemistry. If we replace the hydrogen with an alkyl group, we form an alkoxide ion which functions in a similar way to the hydroxide ion. So Strong and Weak Bases and Base Ionization Constant, K b. As with acids, bases can either be strong or weak, depending on their extent of ionization. A strong base is a base, which ionizes completely in an aqueous solution. The most common strong bases are soluble metal hydroxide compounds such as potassium hydroxide. The most common weak base is ammonia, which reacts with water to form small amounts of hydroxide ion: \[ NH_3 (g) + H_2 O(l) \rightleftharpoons NH_4^+ (aq) + OH^- (aq) \] If the base is a metal hydroxide, then the general formula for the reaction of an acid with a base is described as follows: Acid plus base yields water plus salt. For Sodium hydroxide, a chemical compound with the formula NaOH, is known to be a strong base. This is because sodium hydroxide undergoes almost complete ionization when it is dissolved in water. Weak bases are the basic substances that do not completely ionize in water. An example of a weak base is ammonia. Ca ( OH) 2 is the strong base. Because it completely dissociates in an aqueous solution to give OH - ion .So, it is a strong base. Since ammonium hydroxide is a weak base. Thus all the options A, B, and D stand incorrect. Hence, the correct option is D i.e. NH 4 OH is a weak base. Suggest Corrections. Weak Acids and Bases - Chemistry LibreTexts 1 2 3 4 5 6 7 8 9 10 11 50g 60gpermol = 0.8mol/L [H+] = Ka × C− −−−−−√ [H+] = (1.85e-5)1/2 = 4.3e-3 [H+] = Ka × C− −−−−−√ H+ H+ [H+] =0.010M H+ HCl HCl [H+] =4.3E-5 [HAc] x = −Ka + (K2a + 4CKa)1/2 2 [H+] C ×Ka− −−−−−√ [H+] menu search Search build_circle Toolbar fact_check Homework cancel Exit Reader Mode In the reaction of a weak acid and a weak base there is no spectator ion. Since there are no spectator ions, the total ionic and the net ionic are exactly the same. Example HF and NH 3. General Equation. HF(aq) + NH3(aq) → NH4F(aq) Total Ionic Equation. HF(aq) + NH3(aq) → NH + 4 (aq) + F − (aq) Net Ionic Equation. Ls0YKba.

which hydroxide is a weak base