The Similarities and Differences between Magnesium Chloride vs Magnesium Sulfate

Before talking about the similarities and differences between magnesium chloride vs magnesium sulfate, we will introduce their basic physical and chemical properties. The chemical formula of magnesium chloride is MgCl₂ and that of magnesium sulfate is MgSO₄. Magnesium chloride, a white or greyish-white powder, is hygroscopic and has low solubility with a melting point of about 714°C. It will emit heat when dissolved in water. Whereas, magnesium sulfate, a white powder, is also hygroscopic and has high solubility with a melting point of about 1,180°C. It doesn't release a lot of heat when it dissolves.

The similarities between magnesium chloride vs magnesium sulfate

In aquaculture, both magnesium chloride and magnesium sulfate can supplement magnesium. Under artificial high-density aquaculture conditions, there isn’t enough calcium, magnesium, phosphorus, and other trace elements in the water body. The lack of calcium will affect the growth and development of aquatic animals and the lack of magnesium will affect the aquatic animals on the absorption of calcium.

Especially in natural freshwater, there are very rare calcium and magnesium ions, which will lead to shrimp and crabs' soft shells, and their growth is slow. So it is necessary to supplement calcium and magnesium together. Magnesium chloride and magnesium sulfate can play a role in supplementing magnesium, thus promoting the absorption of calcium by aquatic animals.

The differences between magnesium chloride vs magnesium sulfate

1. Different applications in industry, agriculture, and medicine

Magnesium chloride is widely used in industry as a raw material for the production of other magnesium salts, such as magnesium sulfate and magnesium oxide. It is also used as a snow melter because it has the function of lowering the freezing point of water. Magnesium sulfate is widely used in agriculture and industry. In agriculture, it is used as a fertilizer to provide plants with the nutrients they need. In addition, it can be used as a desiccant and fire-extinguishing agent.

In the field of medicine, the injection of magnesium sulfate can increase the tension of blood vessels and make them dilate to lower blood pressure. Besides, it can also relax the intestinal smooth muscle, thus playing a role in inducing diarrhea. Magnesium chloride injection can play a role in neutralizing stomach acid, and cleaning the gastrointestinal tract, and can also be used in the treatment of high blood pressure, cardiac arrest, and other diseases.

2. Different adverse reactions when patients use them

Magnesium chloride injection may cause nausea, vomiting, diarrhea, and other symptoms, and may even be accompanied by respiratory distress. Magnesium sulfate injection may cause nausea, vomiting, and other symptoms. It may also be accompanied by flushing, itching, and other phenomena. 

3. Different contraindications of them

For patients with gestational hypertension, intestinal bleeding, and other diseases, it is not recommended to take magnesium chloride, which probably affects the normal development of the fetus. The contraindications of magnesium sulfate mainly include myocardial damage, heart conduction block, and so on. If patients use magnesium chloride and magnesium sulfate at the same time, they may cause drug interactions, leading to affecting the therapeutic effect of the drug.

4. Different ability to modulate aqueous solution for them

When making aqueous solutions, magnesium chloride can dissolve in water quickly. It can make the water softer, and it is suitable to be used for washing clothes, cleaning the floor, and so on. While magnesium sulfate is a kind of salt compound containing magnesium. It dissolves slowly in water in the process of making its water solution because its solubility is lower. Therefore, magnesium chloride is better than magnesium sulfate for modulating aqueous solution.

5. Comparison of the solubility of magnesium chloride vs magnesium sulfate

The solubility of magnesium chloride and magnesium sulfate is relatively similar concerning temperature and pressure. Their solubility increases with temperature and is not insensitive to changes in pressure. However, there are differences in their solubility effects in terms of PH. Magnesium sulfate has a higher solubility in acidic solutions and a lower solubility in alkaline solutions. In contrast, magnesium chloride has a higher solubility in both acidic and alkaline solutions.

Conclusion

It is necessary to conclude the main views on the topic of “the similarities and differences between magnesium chloride vs magnesium sulfate”. Both of them can be used to supplement magnesium which is very important for the absorption of calcium by aquatic animals. There are differences in the fields of industry, agriculture, and medicine, and they have different adverse reactions for patients, different contraindications, and different abilities to modulate solutions.