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1 Stoichiometry

The percentage of copper in a copper(II) salt can be determined by using a thiosulphate titration. 0.305 gm of a copper(II) salt was dissolved in water and added to, an excess of potassium iodide solution liberating iodine according to the following equation 2Cu²�(aq) + 4I^��(aq)�?2CuI(s) + I₂(aq) The iodine liberated required 24.5cm³�of a 0.100 mole dm^-3�solution of sodium thiosulphate 2S₂O₃^2-�(aq) + I₂(aq)�→�2I^��(aq) + S₄O₆^2-�(aq) the percentage of copper, by mass in the copper(ll) salt is. [Atomic mass of copper = 63.5]

1) 64.2
2) 51.0
3) 48.4
4) 25.5

�

Option 1

Option 2 Solution:

Explanation:

�From given reactions

�

mmoles of hypo = mmoles of iodine � 2

�

= mmoles of Cu²⁺�ions

�

= 24.5 � 0.1 mmoles

�

So mass of copper = 24.5 � 0.1 � 10^�3�� 63.5 gm

�

So % of copper =�

? 51.0%

�

Option 3

Option 4

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