What is pH?

A measure of the concentration of H+ ions in a solution.

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What is a strong acid?

An acid which completely ionises (dissociates) in an aqueous solution.

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What is a weak acid?

An acid which only partially ionises (dissociates) in an aqueous solution.

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How does the pH differ between strong and weak acids (assuming they're at the same concentration)?

The strong acid will have a lower pH as it will more fully ionise/dissociate, and so release more H+ ions

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Name 3 strong acids.

  1. Hydrochloric acid.
  2. Nitric acid.
  3. Sulfuric acid. 

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Which category of acids are weak acids?

Carboxylic acids.

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Is the ionisation/dissociation of strong acids reversible?

The ionisation/dissociation of strong acids is not a reversible reaction.

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Is the ionisation/dissociation of weak acids reversible?

The ionisation/dissociation of weak acids is a reversible reaction.

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Why are strong acids more reactive than weak acids?

Strong acids have greater concentration of H+ ions, so more of them will react a given amount of time.


This increases the rate of reaction

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What is a good indicator to use for a titration between a strong acid and a weak alkali?

Methyl Orange.

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Each time the pH increases by 1, how much does the H+ concentration change by?

For each increase by 1 on the pH scale, the concentration of H+ ions gets 10x lower.


For each decrease by 1 on the pH scale, the concentration of H+ ions gets 10x higher.



(remember low pH is acidic - and acidic solutions have a high concentration of H+ ions)

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