Agua dura y agua blanda

Water contains dissolved mineral ions like sodium, calcium, and magnesium, affecting its hardness or softness. Hard water, rich in calcium and magnesium, is beneficial for drinking but can cause appliance issues due to lime precipitation. Soft water, with high sodium content, is ideal for cleaning. The mineral content in water influences daily experiences and varies based on geological factors.

What determines whether water is considered hard or soft?

• The color of the water

• The pH level of the water

• The presence of dissolved mineral ions

• The temperature of the water

Which mineral ions are primarily responsible for making water hard?

• Zinc and lead ions

• Iron and copper ions

• Calcium and magnesium ions

• Sodium and potassium ions

What type of rocks does soft water usually pass over?

• Sedimentary and metamorphic rocks

• Metamorphic and volcanic rocks

• Igneous and sedimentary rocks

• Volcanic and igneous rocks

What is the process called when calcium carbonate forms a solid in heated hard water?

• Sublimation

• Precipitation

• Condensation

• Evaporation

Why is soft water considered better for cleaning purposes?

• It has a higher temperature

• It contains more minerals

• It lathers easily

• It is more acidic