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A student dipped a strip of pH paper in ...

A student dipped a strip of pH paper in distilled water taken in a tube. As expected, the pH paper acquired green colour. He then dissolved a pinch of common sale in the same tube. What will be the expected change in colour of the pH paper ?

Text Solution

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There will not be any change in the colour of the pH paper. It will remain green which indicates that the solution has maintained neutral character. Actually, sodium chloride is a salt prepared from strong base (NaOH) and strong acid (HCl). It is a neutral salt and is not expected to bring any change in the pH of distilled water.
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Knowledge Check

  • When the strip of pH paper was put in a given solution the pH paper changes to orange red. The given solution is most likely to be of:

    A
    sodium hydroxide
    B
    hydrochloric acid
    C
    sodium bicarbonate
    D
    ethanoic acid

  • A colourless liquid sample was tested with pH paper strip. The colour of the strip changed to reddish pink. The sample could be:

    A
    tap water
    B
    sodium hydroxide solution
    C
    distilled water
    D
    ethanoic acid solution

  • Moist sodium bicarbonate was placed on a strip of pH paper. The colour of the strip

    A
    turned blue
    B
    did not change
    C
    turned green
    D
    turned light pink

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