Question

the decomposition of blue dye using bleach was studied. the concentration of bleach was 1.13 m, while the concentration of the blue dye was 6.2 x 10⁻⁶ m. the reaction was monitored by measuring the absorbance at 630 nm. since the concentration of bleach is many times higher than the blue dye we can assume that it remains constant throughout the reaction.

Answer 1

The concentration of sodium hypochlorite (NaOCl) in a bleach solution is determined using a dilution and iodometric titration method, resulting in a 5.28% w/v concentration in the original bleach sample.

Step-by-step explanation:

The question deals with the titration method used to determine the percentage by weight/volume (%w/v) of sodium hypochlorite (NaOCl) in a bleach solution.

To calculate the %w/v concentration of NaOCl, the procedure begins by diluting a sample of bleach and then using iodometric titration to quantify the amount of NaOCl present.

The endpoint of the titration process is observed when the color change from purple to colorless occurs after adding a known concentration of sodium thiosulfate (Na₂S₂O₃). The calculation reveals that the concentration of NaOCl in the original bleach is 5.28% w/v.