Birnessite, [Na,K][Mn IV Mn III ]O 4 xH 2 O, is a mineral with a layered

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Birnessite, [Na,K][MnIVMnIII]O4 · xH2O, is a mineral with a layered structure of the same type as CdI2 (see Fig. 6.25) comprising octahedral MnO6 units. Na+ and Kions and H2O molecules are sited between the layers. The Na/K composition is variable. Analysis for Na is carried out using AAS. A 20 mg sample of birnessite is dissolved in concentrated HCl/HNO3 and the solution made up to 200 cm3 in a volumetric flask. 

(a) Why is birnessite treated with acid? 

(b) Detail how you would proceed with the sodium analysis. 

(c) How would you determine the water content in the sample of birnessite?


Figure 6.25

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Inorganic Chemistry

ISBN: 9781292134147

5th Edition

Authors: Catherine Housecroft

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