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This solution should contain 0.500 grams anhydrous cobalt(II)-sulfate (CoSO4) per litre.

When using mono- or heptahydrate, increase the weighted mass by the relevant molar mass ratio.

Molar masses:

154.996 g/mol CoSO4 (anhydrous)

173.01 g/mol CoSO4.H2O (monohydrate) ==> ratio 173/155 = 1.12, so 0.556 g/L

281.103 g/mol CoSO4.7H2O (heptahydrate) ==> ratio 281/155 = 1.81, so 0.905 g/L

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