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A solution was formed from 0.5284 g of a sample of an alloy containing aluminium.The aluminium was then precipitated as aluminium 8-hydroxyquinolate.The precipitate was separated,dissolved in hydrochloric acid and the 8-hydroxyquinoline formed was titrated with a standard solution of potassium bromate containing potassium bromide.The concentration of the standard potassium bromate solution was 0.0200 M and 17.40cm3 of it were required.The resultant product is a dibromo derivative of 8-hydroxyquinoline.The structural formula of 8-hydroxiquinoline is: 

The relative atomic mass of aluminium is 26.98.

(1) Write the balanced equation for the reaction of the aluminium (III) ion with 8-hydroxyquinoline, showing clearly the structure of the products. 

(2) Give the name of the type of compound which is formed during the precipitation. 

(3) Write the balanced equation for the reaction in which bromine is produced. 

(4) Write the balanced equation for the reaction of bromine with 8-hydroxyquinoline. 

(5) Calculate the molar ratio of aluminium ions to bromate ions. 

(6) Calculate the percentage by weight of aluminium in the alloy. 

1 Answer

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The chemical equivalent of Al equals 26.98/12 = 2.248. 

(6) The percentage of the aluminium in the sample is 

The alloy contains 0.74% of aluminium.  

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