Question

A commercail liquid laundry bleach is prepareed by dissolving 5.25 g of sodium hypohlorite NaCIO= 74g in water and diluting to a final volume 100ml. what is the % (M|v) of NaCIO?

Answer 1

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Answer 2

Answer:

5.25% w/v means: 5.25 gram per 100 ml.

You have 4 ml: (5.25/100) * 4 = 0.21 gram

Now from gram to mole, divide by then molar mass of NaOCl (=22.99 (Na) + 16.00 (O) + 35.45 (Cl) = 74.44 grams/mole

So: 0.21 grams/74.44 grams/mole = 0.0028 mole, or 2.8*10-3 mole