28. (a) (i) Write down the words or phrases from the brackets that will correctly fill in the blanks in the following sentences: (1) Pure water consists almost entirely of ....................... (ions/molecules)   29. (2) We can expect that pure water ...................... (will/will not) normally conduct electricity.   30. (ii) To carry out the so-called "electrolysis of water", sulphuric acid is added to water. How does the addition of sulphuric acid produce a conducting solution?   31. (iii) Copy and complete the following sentence: With platinum electrodes hydrogen is liberated at the .................. and oxygen at the .................... during the electrolysis of acidified water?   32. (iv) When the electrolysis of acidified water is carried out: (1) What is the ratio of the volume of hydrogen produced to the volume of oxygen?   33. (2) Give the equation for the discharge of ions at the cathode.