0.025 N sodium thiosulfate (Na2S2O3) 용액 제조 방법

0.025 N sodium thiosulfate (Na2S2O3) 용액 제조 방법

티오황산나트륨

 

How do you make 0.025 N sodium thiosulfate (Na2S2O3) solution?

 

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Na2S2O3 gives 1 electrons per mole Na2S2O3 in reduction reaction:

2S2O3^2- → S4O6^2- + 2e^-

 

So 0.025 N = 0.025 M Na2S2O3

Na2S2O3의 당량수 = 1

 

The only stable and pure form of Na2S2O3 to handle on the analytical balance is

(Na2S2O3*5H2O) so the molar mass is 248.21 g/mol.

 

Na2S2O3 = 158.11 g/mol

H2O = 18.02 g/mol

158.11 + 5*18.02 = 248.21 g/mol

 

Need of 1.0 L solution to make:

(248.21 g/mol) * (0.025 mol/L) = 6.2053 g/L to be dissolved.