Question

Boiling of hard water is helpful in removing the temporary hardness by converting calcium hydrogen carbonate and magnesium hydrogen carbonate to

• A. $CaCO _{3}$ and $Mg ( OH )_{2}$
• B. $CaCO _{3}$ and $M _{2} CO _{3}$
• C. $Ca ( OH )_{2}$ and $MgCO _{3}$
• D. $Ca ( OH )_{2}$ and $Mg ( OH )_{2}$

Answer 1

Answer: (A)

$Mg \left( HCO _{3}\right)_{2} \xrightarrow{\text { Boil }}Mg ( OH )_{2}+2 CO _{2} \uparrow$
$Ca \left( HCO _{3}\right)_{2} \xrightarrow{\text { Boil }}CaCO _{3}+ H _{2} O + CO _{2} \uparrow$