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1. Platinum foil gets easily poisoned by the impurities present in the gas and HCl.
2. It is rather difficult to regulate the pressure of the H2 gas to be at exactly 1atm throughout the experiment.
3. Excess of H2 bubbling out carries little HCl with it and hence the H+ concentration decreases. In such a system, it is difficult to maintain the concentration of HCl at 1M.
4. It can not be used in the presence of oxidizing agents.
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