Frequent question: Why should we always use water bath while boiling the leaf in alcohol solution?

Is it necessary to use a water bath while boiling a leaf in alcohol during the activity to show sunlight is essential for plants justify your answer?

Answer: The use of water bath to boil alcohol is essential in the sense that alcohol has a very low boiling point, for this reason, if alcohol is exposed to fire, it can easily catch fire, therefore giving it a water bath is recommended.

Why do we boil leaf in water bath?

Iodine solution is used to test leaves for the presence of starch. … add the leaf to boiling ethanol in a water bath for a few minutes (the boiling ethanol dissolves the chlorophyll and removes the green colour from the leaf – it turns white so it is easy to see the change in colour)

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Why alcohol is kept over a hot water bath instead of heating it directly?

As alcohol is a highly flammable substance, it can’t be heated directly. It must be heated in a water bath.

Why is water bath used for heating organic compounds?

It is also used to enable certain chemical reactions to occur at high temperature. Water baths are preferred heat sources for heating flammable chemicals, as their lack of open flame prevents ignition.

What type of leaf is used for the above experiment?

Iodine solution is used for the test. (iii) A variegated leaf, i.e. a leaf which contains green and non-green parts, was used for the experiment, e.g. Coleus.

wHat happens when a leaf is boiled in water?

Boiling the leaf damages the membranes of the cells allowing the pigments to be leached out of the cells. After leaching, the iodine solution added will combine with any starch in the cells producing a dark purple to black pigment in the leaf.

How can you Decolourise a leaf?

Transfer the leaf from boiling water to a beaker containing ethanol and boil the leaf in a water bath to decolorize it. Remove the leaf from the beaker and rinse it in room temperature water. Place this leaf in a petri dish and cover it with a few drops of iodine solution.

Why do leaves become Colourless after boiling in spirit?

wHat do we conclude? When we boil the leaves in spirit they become colourless because chlorophyll pigments leach out. Leaves contain starch which gives blue-black colour with iodine solution. Starch is synthesised in the green leaves in the presence of sunlight by the process of photosynthesis.

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Why we Cannot boil the leaf directly in alcohol?

This is because heating the green leaf directly on the flame, or boiling it in water will kill the leaf as the direct heat will damage the cells of the leaf. On the other hand, boiling the leaf in alcohol only causes the chlorophyll to break down, and the leaf gets decolourised as it loses its green colour.

Why are esters prepared in a warm water bath?

Explanation: The water bath will help the ester to get separated from the alcohol and the acids so that we can obtain the pure ester at the end of the process. The acids and alcohol will get dissolved in water and they form a thin layer in the beaker where ester is stored.

Why do we use a water bath?

A water bath is a laboratory equipment that is used to incubate samples at a constant temperature over a long period of time. Water bath is a preferred heat source for heating flammable chemicals instead of an open flame to prevent ignition.

Can you boil water in a beaker?

Water in a beaker cannot be made to boil by placing it in a bath of boiling water.

What is the proper way of heating chemicals?

Heat Gradually and Uniformly

When heating chemicals in small or large batches, you should introduce heat gradually and evenly to your desired temperature. Be aware of your temperature ranges to avoid overheating, which can be dangerous as well as destructive and wasteful.