Posted by RS High School on Tuesday, November 9, 2010 at 6:59am.
How many milliliters of a 0.1 M NaOH solution is needed to completely neutralize 1 liter of lemonade containing 25% citric acide

Chemistry  Dr Russ, Tuesday, November 9, 2010 at 8:33am
25% is a lot of citric acid in lemonade, it is usually ca 5% or less.
Start from a balanced equation:
NaOH + 3carboxy3hydroxypentanedioic acid > 3carboxy3hydroxypentanedioic acid, trisodium salt + H2O
which you need to balance
OK. Let us assume that the 25% is by weight and that the density 1.00 g L^1
so our solution contains 250 g of citric acid, molar mass = 192 g mole^1
so the number of moles =
250 g/192 g mole^1
from the balanced equation we can work out how many moles of NaOH react with
1 mole of citric acid.
Hence work out how many moles (N) of NaOH react with 250 g/192 g mole^1
of citric acid.
To calculate the volume (millitres) of NaOH required
=Nx1000/0.1
it will be a large volume.
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