I tried to make Na[Al(OH4)] solution , using NaOH and Al2(SO4)3.18H2O as sources in 11:1 molar ratio , to have excess NaOH which prevents Al(OH)3 precipitation but still I see disperse precipitant in solution. I even try 15: 1 NaOH : Al2(SO4)3.18H2O molar ratio but that doesn't works too. Total Volume is 17 ml , would extra water and lower concentration of NaOH be usefull?