3) Approximately 34% of total drinking water treatment plants (serving <10,000 p

Question

3) Approximately 34% of total drinking water treatment plants (serving <10,000 people) in the USA utilized bleach as a disinfectant to treat groundwater. Chlorine from bleach destroys unpleasant tastes of raw water reacting with hydrogen sulfide, ammonia, as well as other foul-smelling algal secretions besides preventing waterborne diseases. USEPA reported many chlorination byproducts of potential adverse health effects such as trihalomethanes and halo acetic acids from bleach treatment of water. Therefore, it is critical to determine the balanced mass of bleach for the treatment, hence the mass percent of chlorine in bleach.

1.Calculate the mass percent of chlorine in bleach.

2.Utilize mass percent of chlorine in bleach to calculate the mass of chlorine in gram in 1.00 kg of bleach, provided that the bleach has 8.5% (w/w) of an active ingredient NaClO.

3.Utilize chemical formula to calculate the mass of chlorine in gram in 1.00 kg of bleach.

4.Check whether the answers in #c and #d are same.

Explanation / Answer

Bleach is NaOCl

1.

Mass% of Cl in bleach = (Mass of Cl / Mass of Bleach) * 100 = (35.5 / 74.5) * 100 = 47.65%

2.

100 g of bleach has 8.5 g of NaClO

1000g of bleach has 85g of NaClO

Now,

100 g of NaClO has 47.65 g of Cl

85 g of NaClO has (47.65 / 100) * 85 = 40.5 g Cl

3.

It will be the same as answer 2 . Mass of Cl = 40.5 g

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