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Question 55

If the formula of Borax is Na$$_2$$ B$$_4$$O$$_x$$(OH)$$_y$$ $$\cdot$$ zH$$_2$$O, then x + y + z = _____

Correct Answer: 17

Solution

The formula of borax is Na₂B₄O₅(OH)₄ · 8H₂O.

Comparing with Na₂B₄O$$_x$$(OH)$$_y$$ · zH₂O:

$$x = 5$$, $$y = 4$$, $$z = 8$$

$$x + y + z = 5 + 4 + 8 = 17$$

This matches the answer key value of $$\mathbf{17}$$.

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