CHEMISTRY HELP - concentrations, percent error etc?

0.004984 M concentration of hypochlorite in the buret solution (Total volume – 130.0 mL). -original household bleach solution was diluted 50:1 to obtain the hypochlorite solution in the buret. -concentration of hypochlorite ion in the original bleach solution is 0.2492 M. ****NEED ANSWERS TO THE FOLLOWING... show more 0.004984 M concentration of hypochlorite in the buret solution (Total volume – 130.0 mL).
-original household bleach solution was diluted 50:1 to obtain the hypochlorite solution in the buret.
-concentration of hypochlorite ion in the original bleach solution is 0.2492 M.

****NEED ANSWERS TO THE FOLLOWING Questions****:

1. The active ingredient in household bleach is sodium hypochlorite, NaOCl. Calculate the % (w/v) concentration of this active ingredient in household bleach. Note: w/v refers to weight per volume, in this case, mass of NaOCl per mL of 130mL solution

2. Using the % w/v (found in question 1) of NaOCl on the bottle of bleach, calculate the % error in your experiment.

3. Give 2 reasons for experimental error, that would result in a positive or negative error.

4. Explain 2 advantages and 2 disadvantages to the colorimetric method to determine the concentration of species over the classical titration method used in previous experiments.
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