Consider the polarity of the ions released when the water
decomposed. Which gas collected at the cathode? Why? (Oxygen.
Oxygen ions are positive and the cathode is negative. were there
more hydrogen bubbles than oxygen bubbles? (Water contains twice
as many hydrogen atoms as oxygen atoms.) did the chlorine gas
generated in step 10 come from? (Ions of chlorine that had
formed when table salt (NaCl) was dissolved in water.) In
addition to generating free chlorine gas, how might adding a
"pinch" of salt affect the decomposition of water? (The salt
would make the water more conductive and therefore increase the
rate of electrolysis.)