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Explain how pH changes can be minimised using a mixture of a weak acid and it's conjugate base

This mixture of a weak acid (HA) and it's conjugate base (A - ) acts as a buffer . A buffer is a solution with a highly stable pH. On addition of small amounts of either a strong acid or a strong base, this ...
CT
Answered by Cora T. • Chemistry tutor
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Explain the term Direct Democracy as used in the extract (5 marks)

5 mark definition questions may be broken down into three parts: 1) Define Term: Direct democracy is where citizens (members of the electorate) have a direct input into the decision making process. It is sai...
CW
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What are the differences between the past tenses and how do I use them?

In French, there are 2 main past tenses - the passé composé, and the imparfait. The passé composé is used when an action has been completed, for example, when in English we would say 'I ate' or 'I have eaten...
KO
Answered by Kitty O. • French tutor
7788 Views

Quand utiliser le/la et quand utiliser l' pour un nom ?

Quand il s'agit de parler d'un nom en français, le déterminant (le ou la) dépend du genre du nom, féminin ou masculin. Pour un nom masculin, il faut utiliser le déterminant le, exemple : le train, le bateau,...
JZ
Answered by Judith Z. • French tutor
4740 Views

Should I be naming historians in my essays?

My caveat about using historians' names is always that it can seem to the reader that you are 'hiding' behind an established viewpoint.Examiners are always looking for that 'independent judgement' that makes...
GH
Answered by George H. • History tutor
5958 Views