Frozen orange juice gets downright solid. So does frozen pineapple juice, grape juice, and every other juice I’ve tasted. So why doesn’t my frozen lemonade solidify? I ran a search, but turned up nothing.
I think it has too much sugar.
Cecil notices this too, but doesn’t explain why: http://www.straightdope.com/classics/a2_040a.html
Though he does say that apple and grape juice act like lemonade in this regard, too.
WAG: lemon juice concentrate requires lower temps in order to freeze because it is more acidic.
Whoa, wait. Cecil says the exact opposite of that (OJ has a “mushy intermediate” but the others act like water… liquid, or frozen solid).
Are we sure the OP is really true? I think frozen lemonade freezes solid as ice, unless it’s specially produced as a soft-serve beverage.
I have never seen canned frozen lemonade get anywhere close to solid. Not in the freezer in the store, not in any freezer I have owned. I have no idea how acidity would affect freezing point. Is lemonade saltier than orange juice?