Question #767

Na2SO4 * xH2O, the hydrated salt is overheated and the anhydrous salt thermally decompose, one product being a gas; will the reported value of "x" be too high, too low on the unaffected? explain

Expert's answer

Na_{2}SO_{4}*xH_{2}O = (dehydratation) = Na_{2}SO_{4} + xH_{2}O.x = n(H_{2}O)/n(Na_{2}SO_{4}*xH_{2}O), where n(H_{2}O) and n(Na_{2}SO_{4}*xH_{2}O) the number of moles of the water and of the hydrated salt respectively.The sodium sulfate exists mostly in the dehydrate form: Na_{2}SO_{4}*10H_{2}O, so x would be equal to 10.

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