Solution of magnesium sulfate?

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In summary, the individual is looking to create a solution of 15% magnesium sulfate by mass in water, using epsom salts and calculating the required amount. They use atomic weight to determine the mass of magnesium sulfate and 7H2O, and then combine these values to get a total mass of 246.36. They then use a proportion to calculate that 2.54 pounds of epsom salts is needed to get 1.24 pounds of magnesium sulfate. They mention needing to account for the mass of water added, and state their intention to fill a blimp envelope with hydrogen.
  • #1
HarryA
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I would like to make a solution of magnesium sulfate (MgSO4) that is 15%
magnesium sulfate by mass in water. As magnesium sulfate is sold as epsom salts which is
MgSO4 7H2O I need a way to calculated the epsom salts required for the required
magnesium sulfate or 1.24 pounds per gallon of water (Water at 8.35 pounds per gallon).I am thinking one goes by atomic weight?
For MgSO4:
Mg= 24.3 S= 32.06 Oxgen4= 4* 16 = 64 MgSO4= 120.36

For 7H2O:
7H2 = 7*1*2 = 14 7Oxgen = 7* 16 = 112 7H2O= 126.0

For MgSO4 7H2O= 120.36 + 126.0 = 246.36

So to get 1.24 pounds of MgSO4: 1.24 * 246.36/120.36 = 2.05 pounds perhaps?

Thanks in advance.
 
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  • #2
HarryA said:
MgSO4= 120.36
Check.
HarryA said:
7H2O= 126.0
Check.
HarryA said:
MgSO4 7H2O= 120.36 + 126.0 = 246.36
Check.
HarryA said:
2.05 pounds perhaps?
Not check.
Take another swing at the proportion. You'll also want to account for the mass of water you're adding as hydrate.
 
  • #3
Thanks.
So the ratio of water in epsom salts is: 126.0/246.36 = 51.14 % by weight and
48.86% MgSO4. So 48.86% of what weight of epsom salts is 1.24 pounds of MgSO4?
Epsom salts = 1.24/0.4886 = 2.54 pounds ?

I need to fill my RC blimp envelope with hydrogen.
Small_Inflated.JPG
 

1. What is the chemical formula for magnesium sulfate?

The chemical formula for magnesium sulfate is MgSO4.

2. What is the common name for magnesium sulfate?

The common name for magnesium sulfate is Epsom salt.

3. What is the purpose of using magnesium sulfate?

Magnesium sulfate is commonly used as a fertilizer for plants and as a treatment for magnesium deficiency in humans. It is also used in various other industries such as medicine, food, and cosmetics.

4. How is magnesium sulfate produced?

Magnesium sulfate is produced by reacting magnesium oxide with sulfuric acid. It can also be obtained from natural sources such as minerals and seawater.

5. What are the potential hazards of using magnesium sulfate?

Excessive use of magnesium sulfate can lead to magnesium toxicity, which can cause symptoms such as nausea, vomiting, and diarrhea. In rare cases, it can also lead to cardiac and respiratory problems. It is important to use magnesium sulfate according to recommended guidelines and to seek medical advice if any adverse reactions occur.

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