Some Basic Concepts of Chemistry - Result Question 77

####15. An aqueous solution of 6.3g oxalic acid dihydrate is made up to 250mL. The volume of 0.1NNaOH required to completely neutralise 10mL of this solution is (2001,1M)

(a) 40mL

(b) 20mL

(c) 10mL

(d) 4mL

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Solution:

  1. We know the molecular weight of C8H7SO3Na

=12×8+1×7+32+16×3+23=206

we have to find, mole per gram of resin.

1g of C8H7SO3Na has number of mole

= weight of given resin  Molecular, weight of resin =1206mol

Now, reaction looks like

2C8H7SO3Na+Ca2+(C8H7SO3)2Ca+2Na

2 moles of C8H7SO3Na combines with 1molCa2+

1 mole of C8H7SO3Na will combine with 12 mol Ca 2+

1206 mole of C8H7SO3Na will combine with

12×1206molCa2+=1412molCa2+



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