This question is about cobalt chloride.
Pink hydrated cobalt chloride turns blue when it is heated. The word equation for the reaction is: hydrated cobalt chloride (pink)⇌anhydrous cobalt chloride (blue)+water\text{hydrated cobalt chloride (pink)} \rightleftharpoons \text{anhydrous cobalt chloride (blue)} + \text{water}hydrated cobalt chloride (pink)⇌anhydrous cobalt chloride (blue)+water
What does the symbol ⇌\rightleftharpoons⇌ mean?
A student heats 4.0 g4.0\text{ g}4.0 g of hydrated cobalt chloride in a boiling tube. 1.8 g1.8\text{ g}1.8 g of water is given off. The remaining solid is anhydrous cobalt chloride.
Calculate the mass of anhydrous cobalt chloride produced.
A student heats 4.0 g4.0\text{ g}4.0 g of hydrated cobalt chloride in a boiling tube. 1.8 g1.8\text{ g}1.8 g of water is given off. The remaining solid is anhydrous cobalt chloride.
Calculate the percentage of water contained in the 4.0 g4.0\text{ g}4.0 g of hydrated cobalt chloride.
Practise AQA GCSE Chemistry Reversible reactions and dynamic equilibrium with exam-style questions for Foundation and Higher tier. 30 questions covering Reversible reactions, Energy changes and reversible reactions, Equilibrium, The effect of changing conditions on equilibrium (HT only), The effect of changing concentration (HT only), The effect of temperature changes on equilibrium (HT only), and The effect of pressure changes on equilibrium (HT only), matched to the AQA GCSE Chemistry (8462) specification and written in Paper 1 and Paper 2 style. Every question includes a full worked solution and mark scheme, so you can see where marks are awarded rather than just whether you got the answer right.