C4: Quiz 1
1) The pH scale runs from 0 to 14.
a) What pH do acids have?
b) Roughly, what will be the pH for strong acids?
c) What is the pH for a neutral solution?
d) What pH do alkalis have?
e) Roughly, what will be the pH for a strong alkali?
2) We can measure the pH of a solution by adding a few drops of universal indicator to the solution. What colour will the solution with a few drops of universal indicator turn for the following:
a) The solution is very acidic
b) The solution is not very acidic
c) The solution is neutral
d) The solution is not very alkaline
e) The solution is very alkaline
3)
a) Acids contain what type of ion?
b) Alkalis contain what type of ion?
4) As we go down the pH scale by 1 for acids (e.g. from 4 to 3), by what factor does the concentration of H+ ions increase by?
5) By what factor does the H+ ion concentration increase by when the pH of a solution goes from 6 to 4?
6) By what factor does the H+ ion concentration increase by when the pH of a solution goes from 5 to 2?
7) By what factor does the H+ ion concentration increase by when the pH of a solution goes from 6 to 1?
8)
a) What is a base?
b) What is an alkali?
9) A neutralisation reaction takes place when we react an acid with an alkali.
a) Write the word equation for a neutralisation reaction.
b) Write the ionic equation for a neutralisation reaction in terms of hydrogen ions and hydroxide ions.