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What is the chemical formula for cobalt (II) hydrogen carbonate?

Answer 1

The chemical formula for cobalt(II) hydrogen carbonate is #"Co"("HCO"_3)_2#.

The name tells you that this is an ionic compound, made of cobalt(II) ions and hydrogen carbonate ions.

The symbol for the cobalt(II) ion is #"Co"^"2+"#.

The symbol for the hydrogen carbonate ion is #"HCO"_3^"-"# (you have memorized the formulas of the polyatomic ions, haven't you?).

So, the formula contains #"Co"^"2+", "HCO"_3^"-"#.

We need two "-" charges to balance the "2+" charges on the #"Co"#.

Thus, we need two hydrogen carbonate ions, so we enclose the formula in parentheses followed by a subscript 2.

The formula is #"Co"("HCO"_3)_2#

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Answer 2

Cameron Andrews

Cobalt (II) hydrogen carbonate has the chemical formula Co(HCO3)2.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.