The chemical formula of Tincal is:
Correct answer: C. Na2B4O7 . 10H2O
- A. Na2B2O7 . 10H2O
- B. Na2B4O7 . H2O
- C. Na2B4O7 . 10H2O
- D. Na2B2O5 . 10H2O
Explanation
The chemical formula of Tincal, also known as borax, is Na2B4O7 . 10H2O. This formula reflects the mineral's composition as a hydrated sodium borate, which includes four boron atoms, seven oxygen atoms, and ten water molecules.Option A is incorrect because it has the wrong boron to oxygen ratio, featuring only two boron atoms instead of four. Option B is incorrect because it lacks the complete hydration (10 water molecules) that characterizes Tincal. Option D is incorrect due to both an incorrect boron to oxygen ratio and an incorrect formula structure.
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