Acids and Bases

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  • Created by: zoolouise
  • Created on: 18-04-16 10:45
What is the definition of an acid?
An acid is a compound that donates H+ ions (protons) in aqueous solution.
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What is the process called?
Dissociating.
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What are the common acids and their formulae?
Hydrochloic Acid (HCl), Sulfuric Acid (H2SO4), Nitric Acid (HNO3), Etanoic Acid (CH3COOH)
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What is the definition of a base?
A base is a compound that accepts H+ ions from an acid.
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What are the common bases and their formulae?
Magnesium Oxide (MgO), Sodium Hydroxide (NaOH), Calcium Oxide (CaO), Ammonia (NH3)
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What is the definition of a strong acid?
A strong acid is one that fully dissociates in aqueous solution
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What is the definition of a weak acid?
A weak acid is one that partially dissociates in aquoeus solution
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What happens to the acid when it can donate H+ more easily?
The more easily an acid can donate H+ the stronger the acid.
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What does a concentrated acid consist of?
A large quantity of acid and a small quantity of water.
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What does a dilute acid consist of?
A large quantity of water
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What is the acidic of a solution a measure of?
The concentration of the aqueous hydrogen ions, H+
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Who proposed the pH scale?
Soren Sorenson proposed the pH scale in 1909
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What's the formulae for pH?
-log[H+] (H+ is the concentration of H+ in moldm^3
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What is a sale?
A salt is a compound that forms when a metal ion replaces the hydrogen ion in an acid
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What happens in neutralisation?
The base accepts the H+ ions donate dby the acid and the H+ ions of the acid are replaced by metal ions to form a salt. Neutralisation always produces a salt.
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What is an acid-based titration?
A type of volumetric analysis where the volume of one solution is measured.
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What is a standard solution?
A standard solution is a solution whose concentration is accurately known
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What are the features of a standard solution?
High Purity, Stability, Low hydrogscopicity, High molar mass
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What's the method of performing a titration? (Steps 1-3)
Pour one solution into a burette, use a funnel, remove funnel, read burette. Use a pipette to add a volume of the other solution into a conical flask. Add few drops of indiciator to the solution in the flask.
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What's the method of performing a titration? (Steps 4-6)
Run the acid frm the burette to the solution in the conical flask, swirl it. Stop when indicator changes colour. Read burette again and subtract to find volume used.
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How do you perform double titrations?
One titrations performed, two stages, two different indicators, one added at each stage to calculate the concentrations of both bases.
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When do we use a back titration?
When the titrant can be too slow, or there can be a problem with the end point determination or the base is an insoluble salt.
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How do you perform a back titration?
A known excess of one reagant A reacants with an unkown amount of B. At the end the amount of A reamins is found by titration. A simple calcultion gives the amount of A that's used and B that's reacted.
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Card 2

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What is the process called?

Back

Dissociating.

Card 3

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What are the common acids and their formulae?

Back

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Card 4

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What is the definition of a base?

Back

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Card 5

Front

What are the common bases and their formulae?

Back

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