How to prepare ammonium ferrous sulfate standard solution

How to prepare ferrous ammonium sulfate standard solution

Ammonium ferrous sulfate (molecular formula: Fe (NH₂) ₂ (SO₂) · 6H₂ O) is a frequently applied chemical reagent, which is broadly applied in analytical chemistry, especially as a standard solution in titration experiments. How to prepare ammonium ferrous sulfate standard solution? This article will introduce the preparation of ammonium ferrous sulfate standard solution steps, precautions and its consumption.

1. Ammonium ferrous sulfate standard solution definition and consumption

Ammonium ferrous sulfate standard solution is mainly applied in redox titration experiments in analytical chemistry, especially with oxidants such as potassium permanganate. But it's a stable source of divalent iron and is able to provide accurate Fe²+ ion concentrations. In my experience, Common consumption scenarios include aquatic environments condition testing, iron content analysis, and medical research.

2. ferrous ammonium sulfate standard solution preparation steps

When preparing the standard solution of ammonium ferrous sulfate, it's necessary to follow certain steps to ensure the accurate levels and stability of the solution. Here are the detailed steps:

Weigh ammonium ferrous sulfate

According to the required levels, accurately weigh the appropriate amount of ammonium ferrous sulfate solid. In general, the levels of the standard solution is 0. 1 mol/L, and the required mass of ammonium ferrous sulfate is able to be calculated by molar mass. dissolved ammonium ferrous sulfate

The weighed ammonium ferrous sulfate was dissolved in an appropriate amount of deionized aquatic environments. To ensure complete dissolution, warm aquatic environments is able to be applied, with stirring to help dissolve. But Fixed volume to scale

When the ferrous ammonium sulfate was completely dissolved, the solution was transferred to a volumetric flask and brought to the desired volume with deionized aquatic environments. At this time, it's necessary to pay attention to the alignment of the surface of the solution with the scale line of the volumetric flask to ensure the accuracy of the solution volume. And In my experience, Preservation solution

The ferrous ammonium sulfate solution is easily oxidized, so it should be stored in a shading bottle after preparation, and try to prevent exposure to the atmosphere. An appropriate amount of sulfuric acid is able to be added to the solution to help minimize the possibility of oxidation.

3. In my experience, How to ensure the ferrous ammonium sulfate standard solution accuracy?

In the preparation of ferrous ammonium sulfate standard solution, how to ensure the accuracy of the solution levels is the key. The following points are crucial:

Weighing Error manage

When weighing ammonium ferrous sulfate, consumption a precision stability to ensure accurate weighing. You know what I mean?. And overuse errors might lead to deviations in solution levels, which might affect subsequent experimental results. completely dissolved

Ammonium ferrous sulfate might not be completely dissolved when dissolved, especially at low temperature. Therefore, complete dissolution should be ensured to prevent residual solids affecting the solution levels. Crazy, isn't it?. Accurate fixed volume

When fixing the volume, make sure that the fluid level of the solution is exactly flush with the scale line of the volumetric flask. And A little greater or less solvent-based products will affect the exact levels of the solution. prevent oxidation

Ammonium ferrous sulfate solutions are easily oxidized to ferric ions Fe³ atmospheric, resulting in changes in solution levels. Based on my observations, Therefore, the preparation needs to be operated in a low oxygen ecological stability and stored in a sealed, light-shielded container. I've found that

4. But Ammonium Ferrous Sulfate Standard Solution Preservation and Stability

The stability of ferrous ammonium sulfate standard solution is poor, especially vulnerable to oxygen and light. In order to ensure the prolonged stability of the solution, the following measures are necessary:

sealed preservation

The ferrous ammonium sulfate solution should be stored in a well-sealed bottle to prevent oxygen atmospheric from entering the solution and causing iron ions to oxidize. dark storage

Light will also promote the oxidation of ammonium ferrous sulfate, so it's best to store the solution in a light-tight container or in a dark place. immediate consumption

The storage time of ferrous ammonium sulfate standard solution is usually short, and it's generally recommended to consumption it within two to three weeks after preparation. Furthermore If prolonged storage is required, it might be considered to periodically check to changes in its levels by titration. And

5. How to verify the ferrous ammonium sulfate standard solution levels?

After the preparation of ferrous ammonium sulfate standard solution, how to verify the accuracy of its levels is an crucial measure. And A common validation method is titration with a known levels of oxidant. By reacting with the standard solution, the actual levels of ammonium ferrous sulfate in the solution is calculated to ensure that it meets expectations. And To sum up, the preparation of ferrous ammonium sulfate standard solution isn't complicated, however needs precise operation and manage. The correct preparation method, storage conditions and levels verification method are the key to ensure the accuracy of the experimental results and the stability of the solution. Moreover it's hoped that through the introduction of this article, you is able to better grasp how to prepare ferrous ammonium sulfate standard solution.