Texas Commission on Environmental Quality (TCEQ). Class C Water License Exam

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What causes scale buildup in pots and pans?

Soft water
Hard water
Chlorinated water
Filtered water

The correct answer is: Hard water

Scale buildup in pots and pans is primarily caused by hard water. Hard water contains high concentrations of minerals, particularly calcium and magnesium ions. When hard water is heated, the dissolved minerals can precipitate out and form solid deposits, creating scale. This scale accumulation can be observed as a white or cloudy residue on the interior surfaces of pots and pans. In contrast, soft water is treated to remove these minerals, effectively reducing or eliminating the potential for scale buildup. Chlorinated water refers to water that has been treated with chlorine for disinfection, while filtered water generally refers to water that has been passed through a filtration system to remove impurities, neither of which specifically causes scale accumulation. Thus, hard water is the most significant factor contributing to the formation of scale.