The figure given below represents the experiment carried out between conc. sulphuric acid and sodium chloride, which react with each other to form HCl gas.Blue litmus paper is brought near the mouth of the delivery tube to check the presence of HCl acid but no change is observed in the color of litmus paper because:
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Hcl only turns a blue litmus paper red if it is moist or in an aqueous solution . In this particular reaction, water is not formed. So the HCl is not moist and nor it is in an aqueous solution. Thus it does not behave acidic and does not change the colour of the litmus paper.
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when they experiment this chemical, so they use that litmus paper for this experiment whether is correct or not, and also the litmus paper color is changing or not
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