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For the reaction Al2(SO4)3 + 3Ca(NO3)2 -> 2Al(NO3)3 + 3CaSO4, find the minimum volume (in L) of (5/51) M aluminium sulphate solution that must be added to excess calcium nitrate so that at least 1 g of each product salt is formed.

1. 1/40
2. 1/51
3. 2/51
4. 1/68

Correct answer: 1/40

Solution

CaSO4 (1 g) requires slightly more Al2(SO4)3 than Al(NO3)3 (1 g); that controlling amount corresponds to a volume of 1/40 L.

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