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GK QUESTION#3528

What is the conventional formula of borax, sodium tetraborate decahydrate?

  1. ANa₂B₅O₇·10H₂O
  2. BNa₂B₄O₇·10H₂OCorrect answer
  3. CNa₂B₄O₇·5H₂O
  4. DNa₂B₄O₇·12H₂O
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Answer

B. Na₂B₄O₇·10H₂O

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Explanation

Borax is sodium tetraborate decahydrate, conventionally written Na₂B₄O₇·10H₂O. The dot marks ten waters of crystallisation for each formula unit. The pentahydrate and other listed hydrates are different compositions.

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