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Dissolve 25 g of sodium thiosulphate pentahydrate (Na2S2O3•5H2O, 248 g/mol) in 1 liter of freshly boiled distilled water;

- improve its stability by adding 0.1 g of Na2CO3;

- store overnight, and filter through fine grade paper,

- collect and store in a clean, dark glass bottle.

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12y ago
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11y ago

it depends how many liters or mililiters you want for example:You want to prepare 100mL of 0.1M sodium thiosulfate


first we calculated the grams needed:

100 mL*(0.1 mmole/1 ml)*(248.19 mg/1 mmole)*(1 g/ 1000 mg)

which gives you 2.4819 g of sodium thiosulfate



disolve the 2.4819 grams in 70 mL ofdistilledwater, transfer to a volumetric flask of 100 mL and finish filling it withdistilledwater up to the mark, and then shake to homogenize.

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13y ago

Two thing to be aware about:

  1. Na2S2O3 gives 2 electrons per mole Na2S2O3 in reduction reaction:

    S2O32- --> S4O62- + 2e-

    So 0.025N = 0.025 mole/L reducing electrons = 0.0125 mol/L Na2S2O3

  2. The only stable and pure form of Na2S2O3 to handle on the analytical balance is (Na2S2O3·5H2O) so the molar mass is 2*22.99+2*32.06+5*18.016= 200.22 g/mole

Need of 1.000 L 'thio' solution to make:

200.22 (g/mol)*0.0125 mol/L = 2.503 g/L to be dissolved, stand overnight, filter it till clear, and titrate on standardized bichromate.

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10y ago

weigh 3.1g sodium thio sulphate for 250ml solution

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10y ago

To prepare 0.1N Sodium Thiosulphate simply dissolve 25g of sodium thiosulphate pentahydrate in 1 liter boiled distilled water.

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