Is p-dibromobenzene a solid or a liquid at room temperature? What solvent would

Question

Is p-dibromobenzene a solid or a liquid at room temperature? What solvent would you use to measure the density of napthalene acid? Convert your densities to kg/L and compare those values with the cone in g/mL. If air bubbles were trapped in your solid beneath the liquid level in your density determination, what error would result in the volume measurement? What would be the effect of this error on the calculated density? A liquid unknown was found to be insoluble in water and soluble in cyclohexame and alcohol; the unknown was found to have a boiling point of 58 degree c at 670 mm Hg. What is the substance? What could you do to confirm your answer?

Explanation / Answer

Answer:

1) P- Dibro benzene: solid at room temperature.

Explanation:

If the hydroxyl groups (-OH) attached to the Benzene ring is a chance to be a liquid due to the Hydrogen bonds.

2) Napthalene acid density:

Napthalene acid is a polar compound and it is soluble in polar solvents like ethyl alcohol. Hence ethyl alcohol is the suitable solvent.

3) Kg/L to gram/mL convertion:

1 kg = 1000 grms

1 liter = 1000 mL

Kg/L = 1000 g/ 1000 mL

4) Air bubble:

Due to the presence of the air bubble the volume of the liquid will get more than the actual volume.

density = mass / volume

Here the volume is more, Hence the dfensity will get less than the actual value.

5) The un known substance is insoluble in water (water is the polar) and Insoluble in solvents like cyclohexane and alcohol. Based on this solubility nature the substance is the nonpolar.

The boiling point is given 58 C. The solubility nature and boiling point matches with the Acetone.

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