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ChemistryGeneral Chemistry

Write the Empirical Formula for at Least Four Ionic Compounds from Five Ion Pairs

Balance charges for five ion pairs and write each compound as a smallest-ratio empirical formula.

Question

For each pair of ions, write the formula of the compound they will form:

(a) Ca2+\mathrm{Ca^{2+}}, S2−\mathrm{S^{2-}}

(b) NH4+\mathrm{NH_4^+}, SO42−\mathrm{SO_4^{2-}}

(c) Al3+\mathrm{Al^{3+}}, Br−\mathrm{Br^-}

(d) Na+\mathrm{Na^+}, HPO42−\mathrm{HPO_4^{2-}}

(e) Mg2+\mathrm{Mg^{2+}}, PO43−\mathrm{PO_4^{3-}}

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Evidence boundary

These five formulas follow from the five ion pairs printed in OpenStax Chemistry 2e Exercise 49. The search phrase “at least four” is not claimed as the textbook’s wording, and the formulas do not assert measured preparations.