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Chapter 2: Problem 61

Predict the chemical formula for the ionic compound formed by (a) \(\mathrm{Ca}^{2+}\) and \(\mathrm{Br}^{-},(\mathbf{b}) \mathrm{K}^{+}\) and \(\mathrm{CO}_{3}^{2-},(\mathbf{c}) \mathrm{Al}^{3+}\) and \(\mathrm{CH}_{3} \mathrm{COO}^{-},(\mathbf{d}) \mathrm{NH}_{4}^{+}\) and \(\mathrm{SO}_{4}^{2-},(\mathbf{e}) \mathrm{Mg}^{2+}\) and \(\mathrm{PO}_{4}^{3-}\) .

Short Answer

Expert verified
The chemical formulas for the ionic compounds formed are: (a) CaBr2, (b) K2CO3, (c) Al(CH3COO)3, (d) (NH4)2SO4, and (e) Mg3(PO4)2.

Step by step solution

01

(a) Ca2+ and Br-

For a net zero charge, simply balance the charges of the ions involved in the compound. In this case, one Ca2+ ion has a charge of +2, and one Br- ion has a charge of -1. Therefore, we would need two Br- ions to balance one Ca2+ ion. Chemical formula: CaBr2
02

(b) K+ and CO3 2-

In this case, one K+ ion has a charge of +1, and one CO3 2- ion has a charge of -2. Therefore, we would need two K+ ions to balance one CO3 2- ion. Chemical formula: K2CO3
03

(c) Al3+ and CH3COO-

In this case, one Al3+ ion has a charge of +3, and one CH3COO- ion has a charge of -1. Therefore, we would need three CH3COO- ions to balance one Al3+ ion. Chemical formula: Al(CH3COO)3
04

(d) NH4+ and SO4 2-

In this case, one NH4+ ion has a charge of +1, and one SO4 2- ion has a charge of -2. Therefore, we would need two NH4+ ions to balance one SO4 2- ion. Chemical formula: (NH4)2SO4
05

(e) Mg2+ and PO4 3-

In this case, one Mg2+ ion has a charge of +2, and one PO4 3- ion has a charge of -3. Therefore, we would need three Mg2+ ions to balance two PO4 3- ions. Chemical formula: Mg3(PO4)2

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Most popular questions from this chapter

The nucleus of 6 Li is a powerful absorber of neutrons. It exists in the naturally occurring metal to the extent of 7.5\(\%\) . In the era of nuclear deterrence, large quantities of lithium were processed to remove 6 Li for use in hydrogen bomb production. The lithium metal remaining after removal of 6 Li was sold on the market. (a) What are the compositions of the nuclei of 6 Li and 7 Li? (b) The atomic masses of 6 Li and 7 Li are 6.015122 and 7.016004 amu, respectively. A sample of lithium depleted in the lighter isotope was found on analysis to contain 1.442\(\%\) 6 Li. What is the average atomic weight of this sample of the metal?

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