27 WaterSAQ

Eutrophication is caused by the over-enrichment of water by nutrients such as nitrates & phosphates. It can lead to algal bloom.

Temporary hardness can be removed by boiling, while permanent hardness cannot be removed by boiling and requires other methods.

To strengthen teeth and prevent decay.

<p>Calcium hydrogencarbonate decomposes.</p> Signup and view all the answers

<p>To remove permanent hardness by swapping Ca²⁺ or Mg²⁺ ions with Na+ ions.</p> Signup and view all the answers

<p>To remove suspended particles from the water by allowing them to settle to the bottom of the tank.</p> Signup and view all the answers

<p>To bring together small suspended solids in water, making it easier to remove them.</p> Signup and view all the answers

<p>Deionization is a method that removes all ions from water, whereas ion exchange swaps cations with sodium ions. Deionization produces demineralized water, while ion exchange produces water with reduced hardness.</p> Signup and view all the answers

<p>Calcium hydroxide (lime) is added to raise the pH of water, and it is used when water is too acidic to prevent corrosion of pipes.</p> Signup and view all the answers