It seems you're asking about the observations made during the melting of a benzoic acid-salt mixture. However, there's a slight ambiguity in the phrase "benzoic acid-salt". Let's break down the possibilities and what you might observe:

1. Benzoic Acid and a Salt Mixture:

* Observation: The melting point of benzoic acid is around 122.4 °C. If you have a mixture of benzoic acid and a salt (like sodium chloride, for example), you'd likely see the benzoic acid melt first.

* Appearance: You might observe the benzoic acid crystals turning into a clear, oily liquid while the salt remains solid.

* Temperature: The temperature would rise until it reached the melting point of benzoic acid, then plateau as the benzoic acid melts. Further heating would then cause the temperature to rise again as the salt begins to melt (if it melts at a lower temperature than the decomposition point of the benzoic acid).

* Important Note: Many salts have much higher melting points than benzoic acid. This means that the salt might not melt at all within a reasonable temperature range for the experiment.

2. Benzoic Acid Salt (Benzoate):

* Observation: If you are referring to a benzoate salt (like sodium benzoate, potassium benzoate, etc.), the melting point would be different from pure benzoic acid. The melting point of a benzoate salt would depend on the specific salt.

* Appearance: The solid salt would likely melt into a clear liquid, potentially with a slight color depending on the specific salt.

* Temperature: The temperature would rise steadily until the melting point of the benzoate salt is reached. At that point, the temperature would plateau as the salt melts.

To give you a more specific answer, please provide the following information:

* What specific salt are you using?

* Are you mixing the salt and benzoic acid, or is it a benzoate salt?

Once I have this information, I can provide a more detailed explanation of the observations you might make during the melting process.