When ice forms on a freshwater lake, The coldest and densest water is at the bottom of the lake
The colder a water is, the denser the water will become, therefore when ice forms, the coldest part of the water is located at the bottom of the lake because the coldest water is the most dense and will sink down into the lake.
Freshwater lake have a neutral pH level and therefore they are neither acidic or base, therefore the acididty of the water does not have an effect on the dense nature of the ice formed on a freshwater.
Hence we can conclude that when ice forms on a freshwater lake, the coldest and densest water is at the bottom of the lake.
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