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10.1. Water
A subsection of Chemistry, 0620, through 10. Chemistry of the environment
Listing 10 of 242 questions
Describe how cobalt chloride paper can be used to test for the presence of water. Complete the description of the preparation of crystals of the soluble salt, cobalt(chloride-6-water, CoCl 2.6H2O, from the insoluble base, cobalt(carbonate. CoCO3+ 2HCl → CoCl 2+ CO2+ H2O50 cm3 of dilute hydrochloric acid, concentration 2.2 mol / dm3, was heated and cobalt(carbonate was added in small amounts until 6.31 g of cobalt(chloride-6-water crystals were obtained. Calculate the percentage yield to 1 decimal place. number of moles of HCl in 50 cm3 of acid, concentration 2.2 mol / dm3 = maximum number of moles of CoCl 2.6H2O which could be formed = mass of 1 mole of CoCl 2.6H2O = 238 g maximum yield of CoCl 2.6H2O = g percentage yield = %
0620_w14_qp_33
THEORY
2014
Paper 3, Variant 3
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Questions Discovered
242