Calcium and magnesium and other minerals cause hardness in water.

Calcium and magnesium and other minerals cause hardness in water.

• A. True
• B. False
• C. Not a factor
• D. Only in seawater

Answer: (A)

Water hardness comes from dissolved minerals in the water, especially calcium and magnesium ions. These ions come from natural rocks and stay dissolved, giving water its hardness. Calcium and magnesium are the primary contributors, and they affect soap lather and cause scale buildup in pipes and appliances. While other minerals can add a little to the overall dissolved solids, they’re not the main cause of hardness. Hardness is typically expressed as milligrams per liter of calcium carbonate equivalents, and it can be categorized as temporary (due to bicarbonates that can be removed by boiling) or permanent (due to sulfates and chlorides of calcium and magnesium). So the statement is true.

Water hardness comes from dissolved minerals in the water, especially calcium and magnesium ions. These ions come from natural rocks and stay dissolved, giving water its hardness. Calcium and magnesium are the primary contributors, and they affect soap lather and cause scale buildup in pipes and appliances. While other minerals can add a little to the overall dissolved solids, they’re not the main cause of hardness. Hardness is typically expressed as milligrams per liter of calcium carbonate equivalents, and it can be categorized as temporary (due to bicarbonates that can be removed by boiling) or permanent (due to sulfates and chlorides of calcium and magnesium). So the statement is true.