Question

Match a purpose on the left to a procedure that you carried out in recrystallizing benzoic acid. 1. To isolate benzoic acid from water A. Fluted filter paper 2. To dissolve benzoic acid B. Melting Point 3. To remove insoluble impurities C. Filtration Vacuum 4. To induce crystallization D. Filtration Flat paper 5. To hasten filtration E. Flat filter paper 6. To dry the crystals more quickly F. Heating 7. To determine the purity of benzoic acid G. Steam 8. To avoid premature crystallization H. Cooling

Answer 1

To recrystallize benzoic acid, filtration vacuum is used to isolate benzoic acid, heating to dissolve, and flat or fluted filter paper to remove impurities. Cooling induces crystallization, fluted filter paper can hasten filtration, the melting point test determines purity, and steam or controlled cooling helps to avoid premature crystallization.

Step-by-step explanation:

When recrystallizing benzoic acid, several procedures are matched with their corresponding purposes:

1. To isolate benzoic acid from water: C. Filtration Vacuum.
2. To dissolve benzoic acid: F. Heating.
3. To remove insoluble impurities: E. Flat filter paper or A. Fluted filter paper for faster filtration.
4. To induce crystallization: H. Cooling.
5. To hasten filtration: A. Fluted filter paper.
6. To dry the crystals more quickly: No specific procedure given in the information provided. However, spreading them in a thin layer or using a desiccator could be practical methods.
7. To determine the purity of benzoic acid: B. Melting Point.
8. To avoid premature crystallization: G. Steam or careful control of cooling.

Through these procedures, we can efficiently separate benzoic acid from impurities and determine its purity, making use of changes in solubility with temperature, as per the principles of fractional crystallization.