On the pH scale, weak bases measure from 7. They have a low equilibrium constant as compared to strong bases, the weaker the base the lower is the equilibrium constant. Weak bases are not a good conductor of electricity.
They also have a low pKb value also they have a ka value less than 1. They are characterized by positive pka values. They are not highly soluble in water or other solutions. The weak bases are less reactive in nature and therefore react mildly during an acid-base reaction. They are poor electrolytes and a poor conductor of electricity because they have less concentration of free ions.
Water itself acts as a weak base. The tendency to dissociate ions defines the strength of a base. Each strong base has a conjugate weak acid and a weak base has its conjugate strong acid. Strong bases act strongly with acid while weak bases act mildly with acids in an acid-base reaction.
Both the bases have their importance and cannot be replaced with one another. Skip to content A base is a substance that reacts with acids to give salt and water. What is Strong Base? Lesson: 1b. Intro Learn Practice. Do better in math today Get Started Now. Introduction to acid-base theory 2. Conjugate acids and bases 3. Strong and weak acids and bases 4. Autoionization of water 5. Relative strengths of acids and bases 7. Mixing strong acids and bases 9. Hydrolysis Acid-base titration Titration curves Buffer solutions Back to Course Index.
Don't just watch, practice makes perfect. Lessons Notes: In this lesson, we will learn: To understand the difference between acid and base strength and concentration. To understand how degree of dissociation leads to varying acid and base strength. Recall that: Concentration measures the amount of substance in a sample, compared to the amount of solvent e.
This can be changed easily: add more solvent to decrease concentration or add more solute to increase concentration. Acid and base strength acidity or basicity measures dissociation , where the degree of dissociation is how much a chemical compound splits from the complete compound e. HCl into its ions or components e. Many mineral inorganic acids are strong acids, including: Hydrochloric acid, HCl.
Sulfuric acid, H 2 SO 4. Nitric acid, HNO 3. Some strong bases include: Potassium hydroxide, KOH. Sodium hydroxide, NaOH. Calcium hydroxide, Ca OH 2. A weak acid or base experiences partial dissociation into aqueous ions. HC 2 H 3 O 2 is an example of a weak acid:. If an acid is not listed here, it is a weak acid. All strong bases are OH — compounds. When an ionic compound dissolves, it separates into its constituent ions:.
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