chemische formule: 1. 1 g W / l 5% HF 2. 1.261 g WO3 / l 2% NH4OH 3. 12.61 g WO3 / l 2% NH4OH 4. 10 g W / l 5% HF 5. 1 g W / l 5% HF 6. 1.261 g WO3 / l 2% NH4OH 7. 1 g W / l 2 to 5% HNO3 + traces HF 8. 10 g W / l 2 to 5% HNO3 + traces HF