why phosphoric acid is preferred to H2SO4 to prepare HI in situ
Answers
Answer:
Phosphoric(V) acid is used instead of concentrated sulfuric acid because sulfuric acid oxidizes iodide ions to iodine and produces hardly any hydrogen iodide.
Answer:
In the preparation of H2O2 from barium peroxide and sulphuric acid, the use of sulphuric acid has a disadvantage as it catalyses the decomposition of H2O2 formed.
Explanation:
In place of H2O2, weak acids like ortho phosphoric acid, carbonic acid are preferred. All heavy metal impurities present in BaO2 are removed as insoluble phosphates and decomposition of H2O2 is prevented.
Phosphoric acid is generally used in the place of sulphuric acid for the preparation of hydrogen peroxide because barium phosphate gets completely
and the solution of hydrogen peroxide no longer contains free ions.
We present a facile and efficient route to introduce in-plane nanopores on the graphene sheets by activation of graphene aerogel (GA) with phosphoric acid (H3PO4). Results from N2 adsorption and TEM images showed that H3PO4 activation created mesopores with pore size of 2–8 nm on the graphene sheets. With such nanopores on graphene sheets, the activated GA exhibits a specific capacitance of 204 F g−1, enhanced rate capability (69% capacitance retention from 0.2 to 30 A g−1), reduced equivalent series resistance (3.8 mΩ) and shortened time constant (0.73 s) when comparing with the hydrothermally-derived pristine GA and thermally annealed GA in the absent of H3PO4. The excellent capacitive properties demonstrate that introduction of nanopores on GA by H3PO4 activation not only provides large ion-accessible surface area for efficient charge storage, but also promotes the kinetics of electrolyte across the graphene two-dimensional planes.
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