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liquid volumes. Magic


The next practice we will take measurements of volume with the probe and the pipette while we make a fun experience.

start from a known volume of tap water and do a trick "magic." Consist of changing the water glass and appear to be transformed into wine. To move the contents to a third vessel, appear to be transformed into C oca-Cola. In the first conversion, which occurs is that potassium permanganate, which is deep violet, dissolved in water. In the second conversion, hydrogen peroxide reduces the permanganate ion (violet color) to MnO 2 , yellowish solid that remains in suspension. In addition, oxygen is evolved gas. This oxygen, which is responsible for the bubbles, is essential in combustion and that is why if we bring a small flame to an atmosphere rich in this gas, it will burn more vivacity. The chemical reaction that takes place is:

2 KMnO 4 + 2 H 2 O 2 -> 2 MnO 2 + 2 KOH + 2 H 2 O + 2 O 2 -


MATERIAL

Three beakers, graduated cylinder, 100 ml, 2 ml pipette, pear security filter paper.
Products:
Potassium permanganate (KMnO 4 ), concentrated hydrogen peroxide (H 2 O 2). PROCEDURE




Make a small stick about 10 cm long wrapped with filter paper. Leave it ready. Leave
the first glass clean.
Put a few pieces of solid potassium permanganate in the second beaker.
Measured 4 ml of hydrogen peroxide with a pipette and pour into the third beaker.
Measure 100 ml of water with the specimen and Transfer it to the first beaker.

water passes first to the second vessel. Observe and record what happens. Repeat the process
content from the second to the third glass. Observe and record what happens. Turns
cane and Bring it to the beaker near the bubbles. You must hurry and do this before the end of the reaction and hence bubbles are exhausted Observe and record what happens.

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Dehydration of sugar by sulfuric acid

In this practice we will work with the quantity used to measure a chemical reaction curious observe how quickly the sulfuric acid dehydrates the sugar and converts it into charcoal. As also shows a lot of gas, coal would get full of air bubbles, so much the volume increases.

Keep in mind the precautions in the treatment of hazardous substances, in this case sulfuric acid. This acid is very dangerous, because it is toxic and very corrosive, so there be treated carefully.

We will also consider the release of noxious fumes, so this reaction is carried out in fume cupboard. The reaction that takes place is: C

H 12 O 22 11 (s) + 11 H 2 SO 4 (aq) -> 12 C (s) + 11 H 2 SO 4 + 11 H 2 O (g)

The amount of commercial sugar we're going to use need not be very accurate.

The reaction is highly exothermic (gives off much heat.)


MATERIAL

2 Beakers 50 ml graduated cylinder 100 ml, stirrer, fume.

Products:
sulfuric acid (H 2 SO 4 ), commercial sugar.

PROCEDURE Fill

third part of a beaker of 50 ml with sugar. place it in the fume cupboard or well ventilated place. Measure with the probe
25 ml of concentrated sulfuric acid and add it to the first glass. Shake
with the stirring rod until well blended.
Remove the dipstick and see what happens.