When finding melting points why does heating the water slowly give more accurate results?

Answer 1

If you're trying to find the melting point of water, you may have confused your terms. A given substance's melting point is basically the point between solid and liquid phases, whereas the boiling point is the point between liquid and gas phases. I may have misunderstood the question...

To answer your question with the assumption that you are trying to find the melting point of a solid, it does help to heat the solid (or, if you meant that you are heating a water bath that subsequently heats a solid held in a container in the water bath in which case you didn't confuse your terms!) slowly because in so doing, with smaller increments in temperature, you will be able to tell more accurately the temperature at which melting occurred.

While we may not feel it in daily life, there is a fairly big range between two sequencial degree markings. 90.0, 90.1, 90.2 and so on may not feel different to us, but to a chemical, it may "feel" different. If you measure the MP in ten degree markings, you might be able to tell that the solid melted around 100 degrees or 110 degrees. But if you use smaller markings, say 1 degree in size, you can more accurately tell that the substance melted at 106 degrees. Increased precision in measuring instruments might show that, in fact, the substance melted at 106.43 degrees.

So, if you heat the water slowly (depends on your equipment), at 0.2 degree (C) increments, let's say, then you'll be able to see that the substance melted at 106.4 degrees. But if you heat it quickly, such as at 1 degree increments, then even if the substance melted at 106.43 degrees, you could only approximate the MP at 106 or 107 degrees.

I hope thatmakes sense, though it's just part of the answer.

Answer 2

The temperature of the water will rise slowly and evenly distribute the heat.

The melting point of potassium aluminum sulfate as the dodecahydrate is below 100 °C, so water can be used.....

Answer 3

To watch the reaction slowly and record the data much more accurately.

Answer 4

When u heat slowly.it help to determine its melting or boiling point

Answer 5

because it is a good heart