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Nat 5 Specimen Paper Help

Question 13 a) and b). I
The concentration of chloride ions in water affects the ability of some plants to grow.

A student investigated the concentration of chloride ions in the water at various points along the river Tay.

The concentration of chloride ions in water can be determined by reacting the chloride ions with silver ions.

Ag+(aq) + Cl-(aq) --> AgCl(s)

A 20cm^3 water sample gave a precipitate of silver chloride with a mass of 1.435g.

q1(a) Calculate the number of moles of silver chloride, AgCl, present in this sample.

Show your working clearly (2)

Please help and show working
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Avatar for KatsuoK
KatsuoK
2
What I would do:
Using n=m/Mr, 1.435/143.4 (the Mr of AgCl) which gives 0.0100 mol in 1dm^3
20cm^3 is exactly the same as 0.02dm^3, so multiply the number of moles by the volume we're given and I would get 0.000200mol (2.00x10^4)
The marks would be given for finding out the overall moles, and then another for using the volume.


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