The final solution contains: [ P b ( N H 3 ) 4 ] 2 + and [ C o C l 4 ] 2 − [ A l ( N H 3 ) 4 ] 3 + and [ C u ( N H 3 ) 4 ] 2 + [ A g ( N H 3 ) 2 ] + and [ Ni ( N H 3 ) 6 ] 2 + [ A g ( N H 3 ) 2 ] + and [ C u ( N H 3 ) 4 ] 2 + be obtained by heating?