Sodium tetrathionate dihydrate is a salt with the chemical formula, Na2S4O6 2 H2O, that dissolves reasonably well in water. You should avoid trying to dissolve it in hot water, however, since as noted in the MSDS, sodium tetrathionate is heat-sensitive and may break down if heated. The procedure described here will prepare a 0.05 molar solution of sodium tetrathionate, which is a solution that contains 0.05 moles of the salt per liter of solution; if you need a higher or lower concentration, you can adjust the amount of salt you weigh out while keeping the total volume unchanged.
- Goggles, gloves and coat (put these on first)
- Spatula
- Scale
- Sodium tetrathionate
- Powder funnel
- 100-mL volumetric flask
- Cold, deionized water
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Instructions
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1
Measure 1.532 grams, or as close to this as you can get, of the sodium tetrathionate, using the spatula and scale.
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2
Pour the sodium tetrathionate into the volumetric flask through a powder funnel.
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3
Add about 50-mL of deionized water to the flask, and swirl gently until the contents dissolve. If necessary, add more water to ensure they dissolve fully.
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4
Add deionized water until the level in the volumetric flask reaches the line marked on the side of its neck.
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5
Cap the flask and invert it to mix the contents.
