The above examples of sodium bicarbonate and sodium carbonate involved an obvious physical change (dissolving) and a subtle chemical change (change of pH).
(The above examples of sodium bicarbonate and sodium carbonate; involved; an obvious physical change (dissolving) and a subtle chemical change) (an obvious physical change; dissolving; )
The above examples of sodium bicarbonate and sodium carbonate an obvious physical change
involved dissolving
an obvious physical change (dissolving) and a subtle chemical change