The Influence of Old Water and Temperature on Salt Quality: Water Content and NaCl Concentration

Salt is an indispensable chemical substance in various industries and daily life. Despite Indonesia’s extensive salt ponds, we still need to import salt from other countries due to the low quality of local salt. Traditional salt farmers use a simple method that relies on evaporating seawater under sunlight, without the support of modern technology. Consequently, much of the produced salt does not meet quality standards, especially in terms of sodium chloride (NaCl) content.

Salt quality is crucial as it directly impacts various industries and consumers. Natural salt contains various compounds besides NaCl, including magnesium, calcium, sulfate, and chloride. This makes salt quality vary depending on the production location and environmental conditions. One common method to measure NaCl content in salt is using the Mohr Argentometry method, which involves the reaction between salt and standard AgNO3 solution.

The salt-making process involves evaporating seawater to produce what is known as “old water” or water saturated with salt. The water content in salt can affect the NaCl concentration, which is a key parameter in determining salt quality. Salt drying is an important stage in the production process, where temperature and air flow are used to reduce the water content in salt.

Furthermore, to improve salt quality, the technique of recrystallization can be used to purify salt from impurities. Recrystallization involves the process of dissolving salt in hot water and then cooling it down to produce purer salt crystals. Although this process requires additional time and cost, it is essential for enhancing salt quality.

Thus, understanding the influence of old water and temperature on water content and NaCl concentration in salt is crucial in efforts to improve local salt quality. Efforts to enhance salt production and purification processes will help Indonesia reduce its dependence on salt imports and meet domestic needs.

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