I need to determine the open formula of our complex, presumably consisting of sodium tungstate Na2WO4 and aluminum sulfate Al2 (SO4) 3. Our problem is that with an increase in the concentration of the solution above 10 ^ -3 mol / l, the properties and possibly the structure change and it is impossible to achieve a stable monosalt for determining the structure. We need an exact formula to be determined inside the solution. I am waiting for your answers and terms of cooperation.