In standardization of sodium thiosulphate what is the concentration of potassium dichromate.
Both k2Cr2O7 and sodium thiosulphate have same concentration, where K2Cr2O7 act as a primary standard solution. Primary standard means solution whose concentration does not change with time and environmental conditions like temperature, pressure. While sodium thiosulphate act as a secondary standard solution, and it’s standardization is necessary before used for titration. So, both K2Cr2O7 and sodium thiosulphate are of conc. Of 0.025N.
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