Chapter 6, Problem 17E

Interpretation Introduction

(a)

Interpretation:

The chemical formula for the ternary compound, potassium nitrate, given its constituent ions, ${\text{K}}^{\text{+}}$ and ${\text{NO}}_3{}^{-}$, is to be stated.

Concept introduction:

Compounds containing a metal and more than one other element are termed as ternary ionic compounds. The charge on the ternary ionic compounds must always be neutral.

Answer to Problem 17E

The chemical formula for the ternary compound, potassium nitrate is ${\text{KNO}}_3$.

Explanation of Solution

The ternary compound, potassium nitrate contains ${\text{K}}^{\text{+}}$ and ${\text{NO}}_3{}^{-}$ as constituent ions. The potassium ion has a charge of $+1$ and the nitrate ion has a charge of $-1$. One positive ion is required for each negative ion in the formula unit. Therefore, the chemical formula of potassium nitrate is ${\text{KNO}}_3$.

Conclusion

The chemical formula for the ternary compound, potassium nitrate is ${\text{KNO}}_3$.

Interpretation Introduction

(b)

Interpretation:

The chemical formula for the ternary compound, ammonium dichromate, given its constituent ions, ${\text{NH}}_4{}^{+}$ and ${\text{Cr}}_2{\text{O}}_7{}^{2-}$, is to be stated.

Concept introduction:

Compounds containing a metal and more than one other element are termed as ternary ionic compounds. The charge on the ternary ionic compounds must always be neutral

Answer to Problem 17E

The chemical formula for the ternary compound, ammonium dichromate is ${\left({\text{NH}}_{\text{4}}\right)}_{\text{2}}{\text{Cr}}_{\text{2}}{\text{O}}_{\text{7}}$.

Explanation of Solution

The ternary compound, ammonium dichromate contains ${\text{NH}}_4{}^{+}$ and ${\text{Cr}}_2{\text{O}}_7{}^{2-}$ as constituent ions. The ${\text{NH}}_4{}^{+}$ ion has a charge of $+1$ and the ${\text{Cr}}_2{\text{O}}_7{}^{2-}$ ion has a charge of $-2$. Therefore, two positive ions are required for each negative ion in the formula unit. Therefore, the chemical formula of ammonium dichromate is ${\left({\text{NH}}_{\text{4}}\right)}_{\text{2}}{\text{Cr}}_{\text{2}}{\text{O}}_{\text{7}}$.

Conclusion

The chemical formula for the ternary compound, ammonium dichromate is ${\left({\text{NH}}_{\text{4}}\right)}_{\text{2}}{\text{Cr}}_{\text{2}}{\text{O}}_{\text{7}}$.

Interpretation Introduction

(c)

Interpretation:

The chemical formula for the ternary compound, copper $\left(\text{I}\right)$ carbonate, given its constituent ions, ${\text{Cu}}^{\text{+}}$ and ${\text{CO}}_3{}^{2-}$, is to be stated.

Concept introduction:

Compounds containing a metal and more than one other element are termed as ternary ionic compounds. The charge on the ternary ionic compounds must always be neutral

Answer to Problem 17E

The chemical formula for the ternary compound, copper $\left(\text{I}\right)$ carbonate is ${\text{Cu}}_2{\text{CO}}_3$.

Explanation of Solution

The ternary compound, copper $\left(\text{I}\right)$ carbonate contains ${\text{Cu}}^{\text{+}}$ and ${\text{CO}}_3{}^{2-}$ as constituent ions. The ${\text{Cu}}^{\text{+}}$ ion has a charge of $+1$ and the ${\text{CO}}_3{}^{2-}$ ion has a charge of $-2$. Therefore, two positive ions are required for each negative ion in the formula unit. Therefore, the chemical formula of copper $\left(\text{I}\right)$ carbonate is ${\text{Cu}}_2{\text{CO}}_3$.

Conclusion

The chemical formula for the ternary compound, copper $\left(\text{I}\right)$ carbonate is ${\text{Cu}}_2{\text{CO}}_3$.

Interpretation Introduction

(d)

Interpretation:

The chemical formula for the ternary compound, manganese $\left(\text{II}\right)$ sulfite, given its constituent ions, ${\text{Mn}}^{\text{2+}}$ and ${\text{SO}}_3{}^{2-}$, is to be stated.

Concept introduction:

Compounds containing a metal and more than one other element are termed as ternary ionic compounds. The charge on the ternary ionic compounds must always be neutral

Answer to Problem 17E

The chemical formula for the ternary compound, manganese $\left(\text{II}\right)$ sulfite is ${\text{MnSO}}_{\text{3}}$.

Explanation of Solution

The ternary compound, manganese $\left(\text{II}\right)$ sulfite contains ${\text{Mn}}^{\text{2+}}$ and ${\text{SO}}_3{}^{2-}$ as constituent ions. The ${\text{Mn}}^{\text{2+}}$ ion has a charge of $+2$ and the ${\text{SO}}_3{}^{2-}$ ion has a charge of $-2$. Therefore, one positive ion is required to cancel the charge of one negative ion in the formula unit. Therefore, the chemical formula of manganese $\left(\text{II}\right)$ sulfite is ${\text{MnSO}}_{\text{3}}$.

Conclusion

The chemical formula for the ternary compound, manganese $\left(\text{II}\right)$ sulfite is ${\text{MnSO}}_{\text{3}}$.