Calcium Chloride not getting hot

[JamesW]

When calcium chloride hexahydrate dissolves in water, the process is endothermic, meaning it absorbs heat from the surroundings.

Calcium chloride hexahydrate absorbs 31 btu/lb.

31/21 = Temp drop of 1.5 degrees for 1 lb in 2.5 gallons of water.

Calcium chloride tetrahydrate is only slightly exothermic (25 btu/lb).

25/21 = 1.2 degrees temp increase for 1 lb in 2.5 gallons of water.

It's possible that if there really was very little or no temperature rise, the calcium might have been one of these compounds or maybe something else.

 

[JamesW]

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[JamesW]

Y = 0.0431X^2 + 0.3754X -157.3591

Y = Btu/lb.

X= Percentage CaCl₂.
________________________________________________

For 1 lb CaCl₂ added to 2.5 gallons of water:

Y = 20.85Z

Z= Temp rise.

Btu released = (20.85 lb)(Degrees F of Temp rise).

20.85Z = 0.0431X^2 + 0.3754X -157.3591.

Z = 0.00206715X^2 + 0.0180048X - 7.54719904

For example, if the temp rise is 12 degrees then the percentage is 92.98% for CaCl₂.

If the temp rise is 0 degrees then the percentage is 56.23% for CaCl₂.

If the temp drops by 1.48 degrees, that puts the percentage at about 50% CaCl₂.

 

[JamesW]

Y = Temp rise for 1 lb calcium chloride in 2.5 gallons of water.

X = Percentage of calcium Chloride.

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[JamesW]

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[JamesW]

https://waterlinetechnologies.com/content/Cal%20Chlor/94-97_Mini-Pellets_SDS.pdf

https://waterlinetechnologies.com/content/Cal%20Chlor/94-97%20Mini%20Pellet%20Specifications.pdf

 

[JamesW]

Calcium Chloride anhydrous gives 317.2 Btu/lb. when dissolved in water.

Solubility in water = 74.5 g/100ml at 20°C.

Adding 1 lb anhydrous CaCl₂ to less than 0.3 gallons of water will result in the water boiling (Water temp = 84 degrees before adding CaCl₂.)

Y = Temperature Rise.

X = Gallons of water.

For 1 lb CaCl₂.

Gallons.....Temperature rise (F).

0.12...............317.2

0.161...............236.4 (Maximum Solubility is 1 lb in 1.34 lbs of water).

0.24...............158.6.

0.30...............128 (128 + 84 = 212).

0.48.................79.3

1.0...................38

1.5...................25

2.0...................19

2.5...................15.2

3.0...................12.67