I am trying to identify an unknown carboxylic acid.

This is what I did:

1. 0.49 grams of Maleic Anhydride was added to 3.0mL of water.

2. It was brought just barely to boiling.

3. 0.36g of Zinc was immediately added.

4. The mixture stood for 15 minutes with occasional stirring while the Zinc dissolved.

5. 1.0 mL of concentrated HCl was added.

6. The mixture was heated to boiling.

7. The hot solution was filtered through a filtering pipet, and rinsed with hot water.

8. The filtrate was boiled, and then cooled to room temperature.

9. It was then allowed to crystallize in an ice/water bath.

10. The product was collected by vacuum filtration.

11. The product was washed with Acetone, and heated in the oven to dry

Final mass was 0.19 g

melting point was also found to be between 183.1 and 185.7

A drop of phenolphthalein indicator was added, and 0.1M NaOH solution was titrated. The endpoint was reached after 1.0mL was titrated (which I think makes the equivalent weight 190).

First, I'm not sure if that's the right equivalent weight or if I used the machine correctly to find the melting point. Does anyone know what carboxylic acid I have based on the reaction so I can check the melting points and equivalent points against what they should really be?

Thanks!