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Chloride samples are prepared for analys...

Chloride samples are prepared for analysis by using NaCl. KCl and `NH_(4)Cl` separately or as mixture. What minimum volume (in mL) of 5% by mass `AgNO_(3)` solution (sp. Gravity 1.19 g/mL) must be added to a sample of 0.1498 g in order to ensure precipitation of chloride in every possible case?

Text Solution

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The correct Answer is:
8
`M_(AgNO_(3)) = (10 xd)/(M_(0)), = (10 xx 5 xx 1.19)/(170) = 0.35 M`
Given mass(g) No. of moles `(g//M_(0))`
`{:(NaCl,0.1498,0.0025),(KCl,0.1498,0.002),(NH_(4)Cl,0.1498,0.0028):}`
Since the number of moles of `NH_(4)Cl` is most is the volume of `AgNO_(3)` required for complete precipitation of `Cl^(-)` will be highest in this case.
`AgNO_(3)(aq) + Cl^(-)(aq) rarr AgCl darr + NO_(3)^(-)(aq)`
`0.0028 = M_(AgNO_(3)) x V_(AgNO_(3)) rArr V_(AgNO_(3)) = 0.008L` or 8 mL
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