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Flashcards in Acid-base reactions Deck (27):

What is an Arrhenius' acid?

A substance that produces hydrogen ions (H+) or hydronium ions (H30+) when it dissolves in water


What is an Arrhenius' base?

A substance that produces hydroxide ions (OH-) when it dissolves in water.


What is a Lowry-Bronsted acid?

A proton or H+ ion donor


What is a Lowry-Bronsted base?

A proton or H+ ion acceptor


What is an alkali?

A soluble base that contains hydroxide ions (OH-)which can be released into the solution


What is the difference in the ways that acids and bases 'release' their ions into water?

Acids ionise their ions in water, while bases dissociate their ions in water


Define ionise

The process whereby COVALENT compounds break up into ionic substances for the first time

(usually in the presence of water in these cases)


Define what it means when a substance dissociates its ions

The process whereby ionic compounds break up into their separate ions in the presence of water


Why is the H+ ion called a proton

It is essentially a Hydrogen atom that has lost its electron. As Hydrogen does no contain any neurons, there is effectively only a proton left in the + ions.


What are conjugate acid-base pairs?

Compounds that differ by the presence of 1 proton or H+ ion.


What do we call substances that can act as either acids or bases?

Amphiprotic or ampholytes


Define a strong acid

An acid which ionises completely in water

to form a high concentration of H3O+ ions


Give 3 examples of strong acids

-Hydrochloric acid (HCl)
-Suphuric acid (H2SO4)
-Nitric acid (HNO3)


Define a weak acid

An acid which ionises incompletely in water

to forma low concentration of H3O+ ions


Give 2 examples of weak acids

- ethanoic acid (CH3COOH)
- oxalic acid (C2 H2 O4)


Define a strong base

A strong base dissociates completely in water to form a high concentration of OH- ions


Give 2 examples of strong bases

- Sodium hydroxide (NaOH)
- Potassium hydroxide (KOH)


Define a weak base

A weak base dissociates or ionises incompletely or partially in water to form a low concentration of OH- ions.


Give 5 examples of weak bases

- ammonia (NH3)
- Potassium carbonate (K2CO3
- Sodium hydrogen carbonate (NaHCO3)
- calcium carbonate (CaCO3)


What are concentrated acids or bases

And how are they different to dilute acids and bases

These acids/bases contain a large amount (#moles) of the acid/base in proportion to the volume of water.

Conversely small amount (#moles) for dilute acids/bases


Define concentration

A ratio of the amount of solute to the volume of solvent in a solution


In terms of conductivity what is the difference between strong and weak acids

Same applies to bases**

Strong acids have:
-a high concentration of ions
-because of their high degree of ionisation
-Thus they will be good conductors of electricity

Lower degree of ionisation means lower concentration which means less conductivity


Describe the reactivity of strong and weak acids and bases

Strong = react faster
Because there will be more ions present int he solution

Strong acids or bases will have higher degrees of ionisation or dissocitation (than weak acids or bases)


Define a dilute acid

Contain small amount (#moles) of acid or base in proportion to volume of water


Define hydrolysis

The reaction of a salt with water


Equivalence point of a titration


The point at which the acid or base has completely reacted with the acid or base

The point where the indicator changes colour


Auto ionization of water

The reaction of water with itself to form h30+