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Sodium metasilicate (1 1 g, 50 mmol) is dissolved in 100 mL of water (Solution
A). Sodium tungstate (182g, 0.55mol) is dissolved in 300mL of water in a
separate1-L beaker containing a magnetic stirring bar. To this solution,
165mL of 4M HCI is added in 1-mL portions over 10min, with vigorous
stirring (there is a local formation of hydrated tungstic acid that slowly
disappears).
Õâ¶Î»°ÖÐTo this solution,165mL of 4M HCl is added in 1-mL portions over 10min, ÈçºÎÀí½â£¿£¿£¿ÇóÖú°¡

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