Answer:
Yes, it is possible because on
boiling, \[Mg{{(HC{{O}_{3}})}_{2}}\] will readily decompose to form a
precipitate of \[MgC{{O}_{3}}\] which can be removed by filtration.
\[Mg{{(HC{{O}_{3}})}_{2}}\,\xrightarrow{\text{Heat}}\,\underset{\text{(ppt)}}{\mathop{MgC{{O}_{3}}}}\,\,+{{H}_{2}}O+C{{O}_{2}}\]
As a result, water will become free from
temporary hardness.
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