Question

When a drop of a liquid sample is put on the pH paper, it's colour converts into blue. Then, which type of liquid sample is taken in the experiment?

Answer 1

base type of liquid is there because bases turn red litmus paper blue.

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Answer 2

The liquid sample taken is a Basic sample.

To be more precise, The sample taken is a mild base as the colour change of pH paper is to blue from its neutral green colour.

If sample would be an acidic sample, the colour of the pH paper would change to either yellow or orange or red.

The substances which are highly acidic, change the pH paper's colour to dark red.

But, In the given case, The colour change is to blue.

Thus,

The sample is a Basic sample and not an acidic sample.

Now,

There are some common changes that occur in ph paper:-

When the base is used it changes the pH paper colour from green to bluish shades. It can be blue or indigo or dark purple.

If the base is very weak, it changes the colour of pH paper to bluish- green.

If base is mild and non corrosive , it changes the colour of pH paper to Blue

If base is having a light corrosive action and is a little strong base, it changes the pH paper colour to deep blue.

If base is too strong and highly corrosive, the colour of pH paper turns out to be Violet or deep purple.

Since,

The colour change of pH paper in given case is to blue, the base shall be a mild non corrosive base.

The most common base of such type is NaHCO3.

Thus, the liquid sample of base used can be Sodium Bi Carbonate.


Sodium bi carbonate is a mild non corrosive base which is even used in domestic cooking. It is not a strong base and turns the pH paper's colour to Blue from green.

Thus,

There are possibilities that the sample can be (most probably) NaHCO3.


Thanks!