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Chemistry St Peters3

Acids and Bases Questions

What are strong acids? Acids that ionise completely in aqueous solution.
Why is an indicator needed in a titration of an acid and an alkali? To show the end point when the reaction has completed because the solutions are colourless and there is no obvious change.
What can be calculated from the results of a titration? Concentrations of solutions (in mol per dm3/g per dm3) and masses of substances in solution.
What is hydration? In an acid when water molecules surround the hydrogen ions/protons to keep them in solution.
What is different between strong and weak acids? Strong acids ionise completely in aqueous solution whereas weak acids only partially ionise.
What is different between strong and weak alkalis? Weak alkalis only partially ionise in aqueous solution whereas strong alkalis ionise completely.
What does H+(aq) represent? A hydrated proton (hydrogen ion)
What type of acid is dilute hydrochloric acid? A strong acid at a low concentration.
In a titration, what is used to measure the known volume of solution that is put into the conical flask in a titration? A pipette.
Why should you repeat the titration several times? To improve the reliability of the results.
Why should one of the solutions be a strong acid or alkali? So that the end point is sharp.
Why is dilute nitric acid a strong acid? Because it ionises completely in aqueous solution.
Which indicator would you use for a titration between a weak acid and a strong alkali? Phenolphthalein
Which indicator would you use for a titration between a strong acid and a weak alkali? Methyl orange
Which indicator would you use for a titration between a strong acid and a strong alkali? Any acid-base indicator.
Name two pieces of apparatus used to measure volumes in titration's and state which one has a tap. Pipette and burette: the burette has a tap.
Created by: sallyfizz



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