Write the balanced net ionic equations for the following: (a) aluminum and potassium hydroxide, yielding [al(oh)4] – and hydrogen gas; (b) hydrogen ions and [al(oh)4] –, yielding aluminum hydroxide; (c) aluminum hydroxide and hydrogen ions, yielding [al(h2o)6]3+; and (d) the formation of alum from potassium ions, sulfate ions, [al(h2o)6]3+, and water.