2 Explain the following observations. Set up a balanced reaction equation for the cases where a reaction occurs. 1. Aluminium has a standard reduction potential of -1.66 V for the half cell reaction Al+ + 3e Al. However, it does not spontaneously combust at 298 K in ambient atmosphere. Why? 2. Aluminium dissolves in dilute sulfuric acid. 3. Aluminium does not dissolve in concentrated nitric acid. 4. Aluminium dissolves in aqueous sodium hydroxide.