Correct Answer: Option B

Explanation

A sample of temporary hard water can be prepared in the laboratory by saturating lime water with carbon (IV) oxide. This means passing CO\(_2\) in excess through lime water, Ca(OH)\(_2\) to first obtain CaCO\(_3\), which later changes to soluble calcium hydrogentrioxocarbonate (IV) by passing more CO\(_2\) which imparts temporary hardness to water. 

      Ca(OH)\(_2\)  +  CO\(_2\)  →  CaCO\(_3\) + H\(_2\)O

      CaCO\(_3\) + CO\(_2\) + H\(_2\)O →  Ca(HCO\(_3\))\(_2\)

• What can i study with 155 score in science course? Answer this

  2 Answers   ·   Biology   ·   2 days ago
• Does WAEC give Calculator to student for there exam? Answer this

  3 Answers   ·   Mathematics   ·   4 days ago
• find the value of (16)^3/2 + log0.0001 + log325? Answer this

  13 Answers   ·   Mathematics   ·   10 years ago