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Chemical Reactions in Solutions

Chemistry
Tutor: None Selected Time limit: 1 Day

A 0.3126 g sample of h2c2o4 requires 26.21 ml of particular concentration of NaOH to complete the following reaction. what is the molarity of NaOH

Oct 5th, 2014

The molar mass of oxalic acid is 90.04 g mol-1

2NaOH(aq) + H2C2O4(aq)  Na2C2O4(aq) + 2H2O(aq)

From the balanced equation the reacting ratio of NaOH to C2O42- is 2:1

i.e moles of NaOH / moles of C2O42-  = 2/1

i.e MNaOH × VNaOH = 2/1 × moles of C2O42-

i.e. MNaOH = 2/1 × moles of C2O42-/ VNaOH

= 2/1 × (0.3126 g /90.04 g mol-1) / 0.02621 dm-3

= 0.2649 mol dm-3

Reference:

http://cheminnerweb.ukzn.ac.za/Libraries/Chem_110_2012_S1/Chem_110_Test_2_Solution_2012.sflb.ashx


Oct 5th, 2014

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