L6 : Turmeric Test - Acid Base Salts, Science, Class 7 Video Lecture

hello friends this video on acids bases
and salts part six is brought to you by
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let us look at the next
naturally-occurring indicator that is
tell bear it so turmeric so turmeric is
a very common thing which is often used
in preparing food so it is something
which you often find in your kitchen and
this acts as a natural indicator so the
solid turmeric looks somewhat like this
the appearance is somewhat like ginger
but it is yellow in color and in the
powdered form it looks like this so a
very common ingredient for a lot of food
items which are being prepared so let's
see how do we use the direct acting act
as an indicator so the stomach also we
first create turmeric paper like how we
created the litmus paper so here also we
will take some filter papers and then
these filter papers we're given deposits
of the turmeric paste so how do we
prepare turmeric paste take some
turmeric powder mix it with little bit
of water until you get a paste and then
put that paste on these filter papers
drag the filter papers properly and what
do you obtain you obtain yellow colored
filter bit yellow colored turmeric paper
and then you cut the paper in thin
strips and these strips and act as the
turmeric paper and we can use them also
in a very similar way how we were using
the litmus paper but now we will see how
the color changes in case of turmeric
paper so let us look at the turmeric
test now the terminal paper remains
yellow in acetic solutions in acetic
solution there is no change in color
however when it is put into the basic
solution it becomes dark red so this is
a mistake it should be breezy so when an
acetate solution it will remain yellow
but when put in
a basic solution it will turn into dark
red so looking at this color difference
we can decide whether the solution is
acidic or basic in nature now the
question that arises in your mind what
about the neutral solution because in
neutral solution also the color will
remain yellow the color will not change
so how do we distinguish between acetic
solution and neutral solution so let's
see that so with neutral solution there
will be no change in color now when I
say no change in color what I mean is no
matter whatever is the color of the
paper it will remain unchanged so to
distinguish between acetic and neutral
what do we do we take this strip of
turmeric paper which is half red and
half yellow so see the one which you had
earlier dipped into a basic solution it
has turned dark red on one end so we put
the same strip into an acidic solution
so when you put this into acetic
solution what happens it turns yellow
once again so when I say turns yellow
the red portion also turns yellow in
acetic solution but when you put the
same strip in neutral solution what
happens it remains the same so it will
still be half red and half yellow and it
is put into a neutral solution so when
you have to decide whether a particular
solution is acetic or neutral what you
can do is you can use the same strip
which has first been put into a basic
solution and then check it in the acetic
and neutral solution so that will tell
you which is all yueshen is acetic and
which one is neutral thank you please
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