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Calculate the molarity of sodium hydroxide in the diluted drain cleaner sample

Sodium hydroxide (NaOH) is the active ingredient in drain cleaners.
In an experiment to determine the concentration of sodium hydroxide
in a drain cleaner sample, 25 cm3
of the sample was diluted with
water to 250 cm3
. 10 cm3
of the diluted sample required 16.3 cm3
of
0.14 M sulphuric acid (H2SO4) for complete neutralization.
Given: 2NaOH(aq) + H2SO4(aq) → Na2SO4(aq) + 2H2O(l)

解答 0

  • tayh
    2019-12-27 00:27:48
    no. of moles = molarity x volume; no. of moles of H2SO4 required= 0.14x16.3/1000=X; no. of moles of NaOH required = 2X= Y; molarity of NaOH in the reaction= Y / (10/1000)= Z; molarity of NaOH in the original solution= Z x 10 = ?
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