3. in step 4 of the procedure to standardize the EDTA solution, a student forget

Question

3. in step 4 of the procedure to standardize the EDTA solution, a student forgets to rinse the buret with a Small portion of EDTA solution.(The buret contains water droplets from washing.) If this incorrect concentration of EDTA is used to calculate the ppm CaCO3 of a hard water sample, will the resulting value be too high too low or correct ? Explain briefly 4. Why does the Calmagite indicator change from red to blue when EDTA is added to a solution of cations? Describe what is responsible for the color change.

Explanation / Answer

Some of the EDTA will react with the water droplets contained in the buret and will affect the calculation of ppm CaCO3. The value that will be calculated will be higher in the assumption that the hardness of the water droplets in the buret will be added to that of the original sample. More EDTA is needed in the titration process.

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