Question

6 A student separated hexane. CH. (b.p. 69°C) and heptane, CH, (b.p. 98°C) using the apparatus shown below(a) (i) What was the reading on the thermometer when the first few drops of liquidappeared in C?°C [1](ii) Name this liquid.

Answer 1

The reading on the thermometer when the first few drops of liquid appear is likely to be around 70-75°C. The liquid that appears first on the thermometer is hexane.

Step-by-step explanation:

(i) The reading on the thermometer when the first few drops of liquid appear will be the boiling point of the liquid. Since hexane has a boiling point of 69°C and heptane has a boiling point of 98°C, the reading on the thermometer will be between these two values, closer to 69°C. So, the reading on the thermometer is likely to be around 70-75°C.

(ii) The liquid that appears first will be hexane, as it has a lower boiling point than heptane. Therefore, the liquid that appears first on the thermometer is hexane.