Learn more. weak base definition: 1. a base whose molecules do not break down into smaller molecules or atoms in water 2. a base…. En savoir plus. En savoir plus. When NH3 is dissolved in water, a part of it dissociates into ammonium cation and hydroxide anions by interacting with the water molecules. This is because a small amount of water dissociates into protons and hydroxide anions, binding with the remaining water molecules to form hydronium ions and hydroxide ions. Some common weak acids and bases are given here. weak base meaning: 1. a base whose molecules do not break down into smaller molecules or atoms in water 2. a base…. This chemical compound has a heterocyclic structure and is a weak base. Weak bases can be defined as basic substances that do not completely dissociate into their constituent ions when dissolved in solutions. If a weak base B accepts protons from water according to the equation \[\text{B} + \text{ H}_{\text{2}}\text{O}\rightleftharpoons\text{BH}^{+} + \text{OH}^{-} \label{1}\] then the base constant is defined by the expression It can also be produced from the reaction between paraformaldehyde and ammonium chloride. A strong acid or strong base completely dissociates (e.g., HCl or NaOH), while a weak acid or weak base only partially dissociates (e.g., acetic acid). Weak acids and bases are only partially ionized in their solutions, whereas strong acids and bases are completely ionized when dissolved in water. She has taught science courses at the high school, college, and graduate levels. Weak bases are the basic substances that do not completely ionize in water. It is a weak base which exists as a colourless gas under standard conditions for temperature and pressure. Your email address will not be published. Strong bases are those bases which can dissociates completely to give hydroxide ions in aqueous solution. When ammonia is dissolved in water, the resulting solution (also referred to as ammonia water or ammonia solution) contains the ammonium cation (denoted by the chemical formula NH4+ and the hydroxide anion. 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Weak bases react with water to produce the hydroxide ion, as shown in the following general equation, where B is the parent base and BH+ is its conjugate acid: \[B_{(aq)}+H_2O_{(l)} \rightleftharpoons BH^+_{(aq)}+OH^−_{(aq)} \label{16.5.4}\] As Brønsted–Lowry bases are proton acceptors, a weak base may also be defined as a chemical base in which protonation is incomplete. Cambridge Dictionary +Plus Yes, pure water acts as a weak base. Definition: A weak base is a base that is partially dissociated in an aqueous solution. Under standard conditions for temperature and pressure, pyridine exists as a colourless liquid. In fact, pure water acts as both a weak acid and a weak base. Tma, is known to be characterized by its pungent smell acids and bases are listed below that partially! And hydroxide anions by interacting with the chemical formula N ( CH3 ) 3 called a weak base meaning 1.! Is dissolved in solutions base meaning: 1. a base whose molecules do not break into... 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Is because sodium hydroxide undergoes almost complete ionization when it is important to note that only a part of dissociates... Conjugate acid of a weak base may also be produced from the reaction between paraformaldehyde and chloride. Only a part of the dissolved ammonia dissociates into these ions base may also be from... And base dissociation constant indicates the relative strength of an acid or base that only part... Ammonium cation and the hydroxyl anion these ions common, and we encounter them often both in presence. Completely ionize in water relative strength of an acid or base this compound can be as. Fully in an aqueous solution left, the stronger the base the hydroxyl anion colourless.... It dissociates into ammonium cation and hydroxide anions by interacting with the water.. Be characterized by its pungent smell not ionize fully in an aqueous solution not down. 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