Birnessite, [Na,K][MnlvMniii]O4 • xH2O, is a mineral with a layered structure of the same type as Cdl2 (see Fig. 6.23) comprising octahedral Mn06 units Na+ and K+ ions and H20 molecules are sited between the layers. The Na/K composition is variable. Analysis for Na is carried out using A AS A 20 mg sample of birnessite is dissolved in concentrated HC1/HNO3 and the solution made up to200cm3 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?
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