Paper 1 October/November 2011 CHEMISTRY (9701/11) IGCSE

Hydrated cobalt(II) sulfate loses water when heated to give anhydrous cobalt(II) sulfate. All the
water of crystallisation is lost to the atmosphere as steam.
$When{\text{ }}3.10{\text{ }}g{\text{ }}of{\text{ }}hydrated{\text{ }}cobalt\left( {II} \right){\text{ }}sulfate,{\text{ }}CoS{O_4}{\text{ }} \bullet x{H_2}O,{\text{ }}is{\text{ }}heated{\text{ }}to{\text{ }}constant{\text{ }}mass{\text{ }}the{\text{ }}loss{\text{ }}in{\text{ }}mass{\text{ }}is{\text{ }}1.39{\text{…