Phosphotungstic Acid Solution
Dissolve 10 g of sodium tungstate in 75 mL of water and add 8 mL of orthophosphoric acid. Heat under a reflux condenser for 3 hours, allow to cool, filter and add sufficient water to produce 100 mL.
Dissolve 10 g of sodium tungstate in 75 mL of water and add 8 mL of orthophosphoric acid. Heat under a reflux condenser for 3 hours, allow to cool, filter and add sufficient water to produce 100 mL.