I don't know of any "liquid" application that would breakup rock salt. In fact I believe a liquid would worsen the possibility of breaking it up. You didn't indicate the size of the mound but here is an approach to use if it's not too gigantic.
Salt (NaCl), sodium chloride, mineral substance of great importance to human and animal health, as well as to industry. The mineral form halite, or rock salt, is sometimes called common salt to distinguish it from a class of chemical compounds called salts.
Halite, Sodium Chloride, Rock Salt - DesertUSA. Halite Sodium Chloride. Salt Flat in Bristol Dry Lake - Mojave Desert. Halite (sodium chloride) comes from the Greek halos, meaning "salt" and lithos meaning "rock," and is in fact, better known as rock salt.
Mohs hardness, rough measure of the resistance of a smooth surface to scratching or abrasion, expressed in terms of a scale devised (1812) by the German mineralogist Friedrich Mohs. The Mohs hardness of a mineral is determined by observing whether its surface is scratched by a …
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Salt crystals are usually found in two different forms: rock salt and solar salt. Rock salt is mined from the ground like other minerals, and generally contains the greatest level of impurities. These impurities can increase the likelihood of salt bridging and mushing.
The Scratch Test: Testing a Rock's Hardness (26 ratings ) by Angela Pike . Share this science project ... Now try to scratch the rock salt with the nail. Record what happened. Did the nail scratch the rock salt? If you have other minerals, repeat this test on each of the minerals. Record all of your observations in chart. Author: Angela Pike . Disclaimer and Safety Precautions Education.com ...