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Freezing point of the mixture of muriatic acid / water tap?

1 gallon of acid muriatic hardware store typical mixed with 4 gallons of tap water. Details: I've never had a bottle of muriatic acid. However, it was bought at a hardware store, so that the concentration typically do not know, but I guess that's it. PPL clean your filter know him, I have already diluted. Then I cleaned the filter tubes with him. A bottle, more likely the gallon, 4 gallons of tap water. It is out and has not frozen at all in a few nights 20 degrees F. I looked online and found muriatic points acid freezing at 30 below F and 50 F below, so I'm no help at that point! Sorry! I really want to know if it can be stored in the outdoor shed or bust at some point. Im in central PA, you can hit a few degrees below 0 F here. Note after the cleaning of filters, probable mixture contains salts of calcium, presumably reducing the freezing point beyond just the mixture alone. Thanks!

Holding point freezing of the solution = 14.5 ° F (and slightly lower dissolved calcium salts) I think the usual "hardware" muriatic concentration acid HCl is 31.45% and has a weight of 9.6 pounds per gallon. £ 9.6 x 453.6 g / gal x 31.45% = 1370 g total weight of water = HCl 9.6×453.6 – 1370 + 3 x 3785 = 14340 grams Moles HCl = 1370/36.5 = 37.5 moles Moles of water per kg = 2.62 100% ionized to 2×2.62 = 5.24 molal ion. The freezing point depression = 5.24 x 1.86 = 9.75 degrees C 9.75 x 1.8 = 17.5 º F depression from 32 to 17.5 = 14.5 ° F

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