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luminous
you would use the safety flame when not heating anything because the blue flame is for heating because its hotter than yellow.
You don't have to use the yellow flame but its not recommended for heating as its a lot cooler than the blue flame.
* Yellow safety flame - Safe becasue you can see it easily and know it is there. Not used for heating because it creates soot. * Silent blue flame - Used to for gental heating and is silent and not very visible. * Roaring blue flame - Strongest heating setting and is made of two cones. The outside cone is the flame and it is blue , the inside cone is unburned gas that is purple.
The blue flame is hotter then the orange one. Plus the temperature of the flame is not constant in a orange flame but it is more constant in a blue one.
cool flame is used when you want to maintain your liquid at a constant elevated temp.
Blue flame is a clean flame.
the blue flame
Burning to dryness can cause your watch glass to break. Burning all the methanol allows for contamination to occur. Burning all the methanol off creates a dangerous flame. Burning to dryness can cause your watch glass to break. Burning all the methanol creates a hotter surface as the flame is trying to burn the dry salts. Blow out the flame before the methanol is completely consumed.
The yellow flame because that is the safety flame
a blue flame
luminous
The reason one should stop heating the solution before the liquid has completely evaporated is because heat will continue to carry over even after it is removed from the flame. This means that the liquid will continue to evaporate for a little longer.
The flame should be very pale blue (almost invisible) for heating strongly. This is achieved by opening the air hole fully.
When the air hole is closed, the flame is a luminous flame. This flame is not ideal for heating for the following reasons: it is not as hot as the non-luminous flame it is very unstable it produces a lot of soot thus, only non-luminous flames (the blue one) is ideal for heating. :)
It's hotter than the yellow flame.
As long as the solution is a water-based solution, it should be fine. You should never ever use a Bunsen burner to heat a flammable liquid such as alcohol, ether, acetone, etc.