Arctic explorers learned from indigenous natives that year-old ice, which had gone through a partial melting cycle during the Arctic summer, produced drinkable water when melted but fresh ice did not. The improved purification resulted from sweating and drainage. You can explore sweating and drainage if you have access to a refrigerator that has a freezer. Mix 1.0 gram of common table salt \((\mathrm{NaCl})\) per liter of water (approximately 0.001 mass fraction \(=1000 \mathrm{ppm}\) ). This will make a solution that will taste salty, but it is safe to drink. Next, determine methods and write a protocol to partially freeze the solution, preferably with different freezing rates. Also determine a standard procedure for harvesting the ice and then sweating the ice (partially melting and draining it). Although your tongue can tell if some of the water has had most of the salt removed (old-time analytical chemists did use their senses of smell and taste for qualitative analysis), a better procedure is to arrange access to an electrical conductivity meter so that you can quantify the results. If requested by your instructor, write a report.