Which of the following polyatomic ions has a 3- ionic charge: hydrogen carbonate, hydroxide, sulfate, nitrate, or phosphate?

Answer 1

#PO_4^"3-"#

You can always calculate for the formal charges, or better yet, draw the structure then count the number of electrons. But if you find these methods taxing, then you can always memorize the list of anions and their charges.

(1) hydrogen carbonate or bicarbonate ion: #HCO_3^-#
(2) sulfate ion: #SO_4^"2-"#
(3) nitrate ion: #NO_3^"-"#
(4) phosphate ion: #PO_4^"3-"#

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Answer 2

Caleb Adams

Phosphate has a 3- ionic charge.

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Answer 3

Peyton Adams

The sulfate ion (SO4^2-) has a 3- ionic charge.

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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.