Weigh about 1.2 g of Na2S2O3.5H2O and 0.04 g of Na2CO3 and transfer the solids into a 100 mL volumetric flask. Add a small amount of deionized water to dissolve the solids and fill with deionized water until the mark swirling constantly until a homogenized mixture results.
Part 2: Weigh about 0.2 g of KIO3 then transfer the solution into a 100 mL volumetric flask. Fill the flask with deionized water until the mark swirling constantly until a homogenized mixture results.
Part 3: Clean a burette with deionized water; rinse it with a small (about 5 mL) of the sodium thiosulfate solution then fill the burette with the sodium thiosulfate solution to eye level. Record the initial reading of the burette before attempting the titration.
Measure 20 mL of the potassium iodate solution into an Erlenmeyer flask, add 0.5 g of KI crystals and 2.5 mL of 1 M H2SO4, and swirl until all the KI dissolves. Titrate immediately with the sodium thiosulfate solution until a light yellow solution results. Add 1 mL of the starch solution and keep titrating until the color disappears.
I2 + 2Na2S2O3 â 2NaI + Na2S4O6
IO3- + 5I- + 6H+â 3I2 + 3H2O
Na2S2O3 Titration Volume: 13.96 ml
Calculate the concentration of the Na2S2O3 using your titration data.
Weigh about 1.2 g of Na2S2O3.5H2O and 0.04 g of Na2CO3 and transfer the solids into a 100 mL volumetric flask. Add a small amount of deionized water to dissolve the solids and fill with deionized water until the mark swirling constantly until a homogenized mixture results.
Part 2: Weigh about 0.2 g of KIO3 then transfer the solution into a 100 mL volumetric flask. Fill the flask with deionized water until the mark swirling constantly until a homogenized mixture results.
Part 3: Clean a burette with deionized water; rinse it with a small (about 5 mL) of the sodium thiosulfate solution then fill the burette with the sodium thiosulfate solution to eye level. Record the initial reading of the burette before attempting the titration.
Measure 20 mL of the potassium iodate solution into an Erlenmeyer flask, add 0.5 g of KI crystals and 2.5 mL of 1 M H2SO4, and swirl until all the KI dissolves. Titrate immediately with the sodium thiosulfate solution until a light yellow solution results. Add 1 mL of the starch solution and keep titrating until the color disappears.
I2 + 2Na2S2O3 â 2NaI + Na2S4O6
IO3- + 5I- + 6H+â 3I2 + 3H2O
Na2S2O3 Titration Volume: 13.96 ml
Calculate the concentration of the Na2S2O3 using your titration data.
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