Explain why higher concentrated of nitric acid can only be obtained if it is mixed with concentrated sulphuric acid and redistilled .
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Answer:So that is the maximum concentration obtainable by distillation of a binary nitric acid/water mixture. Concentrated sulfuric acid is a strong dehydrating agent. Its addition to the distillation pot allows the water to be retained in the pot while the nitric acid is distilled away as pure nitric acid.
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