Environmental Chemisty - Water L.C. Chemistry Honours

What is hard water?

• Ice

• Impure water

• Water with Ca and Mg ions

• Water that will not form a lather easily with soap.

Pure water has a

• Neutral pH 
• Negative pH
• Positive pH
• Both Negative and Positive pH

Tags

NGSS.HS-ESS2-5

The ions that cause hard water are;

• Calcium and Manganese ions
• Calcium and Magnesium ions
• Carbon and Magnesium ions
• Carbon and Manganese ions

Tags

NGSS.HS-ESS2-5

Soft water is water that;

• Does not lather
• Lathers with difficulty
• Lathers easily
• Does not form bubbles

Water that runs over limestone rock forms.....

• temporarily permanently soft water
• Soft water
• Permanently hard water
• Temporary hard water

Water that runs over gypsum rock forms..... (contains CaSO₄)

• temporarily permanently soft water

• Soft water

• Permanently hard water

• Temporary hard water

If water contains calcium and hydrogen carbonate ions, it is described as....

• temporarily permanently soft water

• Soft water

• Permanently hard water

• Temporary hard water

If water contains calcium and sulphate ions, it is described as....

• temporarily permanently soft water
• Soft water
• Permanently hard water
• Temporary hard water

Boiling can be used to make which type (s) of water soft.

• Temporary and  permanent hard water
• Soft water
• Permanently hard water
• Temporary hard water

Tags

NGSS.HS-ESS2-5

Washing Soda is called..

• Sodium carbonate
• Sodium hydrogen carbonate 
• Sodium chloride
• Washing powder