Learn how to make different concentrations of molar and normal oxalic acid solutions, which are needed for many applications such as research, practical, pharmaceutical, chemical laboratory, and industries, etc.
Oxalic acid is an organic acid having the formula HO2C−CO2H, or (CO2H) 2, and the systematic name ethanedioic acid. It is the simplest dicarboxylic acid.
It is a white, crystalline substance that dissolves in water and forms a colorless solution. Its name derives from the fact that early researchers extracted oxalic acid from flowering plants of the genus Oxalis, commonly known as wood sorrels.
Generally, a solid form of oxalic acid (C2H2O4) in different-sized packs is supplied in the market by vendors in the form of white crystalline solids that are usually about 98-100% pure.
Properties of Oxalic acid(C2H2O4):
|
Properties of Oxalic acid |
|
|
Molecular weight |
90.034 g·mol−1 (anhydrous) |
|
Appearance |
White crystals |
|
Melting point |
189 to 191 °C |
|
Density |
1.90 g·cm3 (anhydrous, at 17 °C) |
|
Solubility |
Soluble in water, acetone, alcohol, but
poorly soluble in ether |
Requirements of glassware, chemicals, and apparatus:
Digital balance, beaker, pipette, pipette bulb, volumetric flask, measuring cylinder, glass rod, funnel, distilled water, AR/LR grade oxalic acid(C2H2O4 ), etc.
Calculation method:
In this case, we must determine the mass of oxalic acid (C2H2O4) required to make 1 molar solution of C2H2O4, as well as the volume of the solution. We must use the molarity formula, which is,
Molarity= Moles of solute/Volume of solution
Step-by-step, complete answer:
We must first determine the moles of C2H2O4. The solution is 1 L in volume and has a molarity of 1 M. So, moles of C2H2O4 can be calculated as,
Moles of C2H2O4 =Molarity × Volume of solution= 1L
Moles of C2H2O4 = 1 M ×1L=1 mol
Therefore, the mole of C2H2O4 in the solution is 1 mol.
The mass of C2H2O4 is now calculated using the number of moles of C2H2O4.
Number of moles= Mass/Molar mass
The mole of C2H2O4 is 1 mol, and its molar mass is 90.03g/mol.
1=Mass/90.03g/mol
Mass of C2H2O4 =90.03 g
Therefore, to make a 1 M solution of C2H2O4, we need to dissolve 90.03 g of oxalic acid in 1 liter of distilled water.
How to prepare 0.02M oxalic acid solution?
Weigh accurately 1.80 g of oxalic acid and dissolve it in 500 ml of distilled water in a volumetric flask. Once it has completely dissolved, make up the volume to 1000 ml with distilled water and properly mix it.
How to prepare a 0.05M oxalic acid solution?
Weigh accurately 05.50 gm of C2H2O4 and dissolve it in 250 ml of distilled water in a volumetric flask. Once it has completely dissolved, make up the volume to 1000 ml with distilled water and properly mix it.
How do you make a 0.1M oxalic acid solution?
Weigh accurately 09.00 gm of C2H2O4 and dissolve it in 500 ml of distilled water in a volumetric flask. Once it has completely dissolved, make up the volume to 1000 ml with distilled water and properly mix it.
How to prepare 0.2M C2H2O4 solution?
Weigh accurately 18.00 gm of oxalic acid and dissolve it in 500 ml of distilled water in a volumetric flask. Once it has completely dissolved, make up the volume to 1000 ml with distilled water and properly mix it.
How to prepare a 0.25M oxalic acid solution?
Weigh accurately 22.05 g of C2H2O4 and dissolve it in 700 ml of distilled water in a volumetric flask. Once it has completely dissolved, make up the volume to 1 liter with distilled water and properly mix it.
How to prepare 0.5M C2H2O4 solution?
Weigh accurately 45.00 gm of C2H2O4 and dissolve in 400 ml of distilled water in a volumetric flask. Once it has completely dissolved, make up the volume to 01 liter with distilled water, and properly mix it.
How to prepare 1M oxalic acid solution?
Weigh accurately 90.00 gm of oxalic acid and dissolve it in 500 ml of distilled water in a volumetric flask. Once it has completely dissolved, make up the volume to 1000 ml with distilled water, and properly mix it.
How to prepare 2M solution of oxalic acid?
Weigh accurately 45.00 gm of C2H2O4 and dissolve in 200 ml of distilled water in a volumetric flask. Once it has completely dissolved, make up the volume to 250 ml with distilled water, and properly mix it.
How do you make a 1% solution of oxalic acid?
Weigh accurately 01.00 gm of oxalic acid and dissolve it in 50 ml of distilled water in a volumetric flask. Once it has completely dissolved, make up the volume to 100 ml with distilled water, and properly mix it.
How do you make a 5% oxalic acid solution?
Weigh accurately 05.00 gm of C2H2O4 and dissolve it in 50 ml of distilled water in a volumetric flask. Once it has completely dissolved, make up the volume to 100 ml with distilled water, and properly mix it.
How to prepare 10% oxalic acid solution?
Weigh accurately 10.00 gm of C2H2O4 and dissolve it in 50 ml of distilled water in a volumetric flask. Once it has completely dissolved, make up the volume to 100 ml with distilled water, and properly mix it.
How to prepare a 100 ppm solution of oxalic acid?
In a volumetric flask, dissolve 10 mg of oxalic acid in 100 ml of distilled water to produce a 100 ppm stock solution.
How do you make a 10 ppm solution of oxalic acid?
Take 0.1 ml (100 microliters) from 100 ppm stock solution of oxalic acid and dilute it to 10 ml, the resulting solution has a concentration of 1 ppm.
How do you make a 1 ppm solution of oxalic acid?
Take 0.1 ml from 100 ppm stock solution of oxalic acid and dilute it to 10 ml, the resulting solution has a concentration of 1 ppm.
PRECAUTIONS:
- When working with chemicals, avoid contact with skin, eyes, clothing, ingestion, and inhalation.
- Stir a small amount of oxalic acid into a large volume of water at a time, and then dilute the solution.
- When making oxalic acid solutions, it is recommended that always use distilled/deionized water.
- Wear protective gloves, clothing, eye protection, and face protection.
- Wash your hands/skin thoroughly after handling.
- Excessive consumption of oxalic acid or prolonged skin contact can be hazardous.
- The hazards of C2H2O4 include its toxic and corrosive nature.
- Always store the oxalic acid in sealed containers or in a desiccator to protect it from moisture and light.
- Solutions are corrosive; contact can cause serious skin and eye irritation. Therefore should be handled with care, follow laboratory safety measures (SOP/Procedure), and please use extreme caution when preparing the solution concentrations.
References:
- Indian Pharmacopoeia: 1996 Wikipedia contributors. (2023, Jan 31). Oxalic acid. In Wikipedia, The Free Encyclopedia. Available Here:
- What Is the Difference between Molarity and Normality? Westlab Available Here:
- Laboratory Solution Preparation, Available Here:
- Molarity of 0.1 N oxalic acid is: Vedantu, Available Here: