Question

Write the chemical formula for the compound formed by each pair of positive and negative ions. ba2+ and no−3: al3+ and co2−3: k+ and po3−4

Answer 1

$\boxed{{\text{Ba}}{{\left( {{\text{N}}{{\text{O}}_{\text{3}}}}\right)}_2}}$ is the chemical formula formed from its respective ions.

$\boxed{{\text{A}}{{\text{l}}_2}{{\left( {{\text{C}}{{\text{O}}_{\text{3}}}}\right)}_3}}$ is the chemical formula of their respective ions.

$\boxed{{{\text{K}}_3}{\text{P}}{{\text{O}}_4}}$ is the chemical formula of their respective ions.

Further Explanation:

Chemical formula:

It provides complete information about various elements present in the compound and their corresponding proportion in it.

Steps followed to write the chemical formula of a compound are as follows:

1. The letter symbols of cation and anion are to be written.

2. The charges on cation and anion are to be identified. Generally, group 1 elements have a charge of +1, group 2 elements have a charge of -2, Group 16 elements have a charge of -2, group 17 elements have a charge of -1.

3. The total positive and negative charge needs to be balanced. To balance them, write the charge present on anion as a subscript for cation and the charge on cation as a subscript for the anion.

(A) Given ions are ${\text{B}}{{\text{a}}^{2+}}$ and ${\text{NO}}_3^-$ . The charge on barium cation is +2 while that on nitrate anion is -1. The positive and negative charges that are present in the compound must be equal in order to maintain electrical neutrality of the compound. So one barium ion must be connected with two nitrate ions and therefore the chemical formula formed by these ions is ${\text{Ba}}{\left( {{\text{N}}{{\text{O}}_{\text{3}}}}\right)_2}$ . (Refer to the attached image)

(B) Given ions are ${\text{A}}{{\text{l}}^{3+}}$ and ${\text{CO}}_3^{2-}$ . The charge on aluminium cation is +3 while that on carbonate anion is -2. The positive and negative charges that are present in the compound must be equal in order to maintain electrical neutrality of the compound. So two aluminium ions must be connected with three carbonate ions and therefore the chemical formula formed by these ions is ${\text{A}}{{\text{l}}_2}{\left( {{\text{C}}{{\text{O}}_{\text{3}}}}\right)_3}$ . (Refer to the attached image)

(C) Given ions are ${{\text{K}}^+}$ and

${\text{PO}}_4^{3-}$ . The charge on potassium cation is +1 while that on phosphate anion is -3. The positive and negative charges present in the compound must be equal in order to maintain electrical neutrality of the compound. So three potassium ions must be connected with one phosphate ion and therefore the chemical formula formed by these ions is ${{\text{K}}_3}{\text{P}}{{\text{O}}_4}$ . (Refer to the attached image)

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Answer details:

Grade: Senior School

Subject: Chemistry

Chapter: Basic concepts of chemistry

Keywords: chemical formula, ions, cation, anion, one, two, three, barium, potassium, nitrate, carbonate, phosphate, Ba2+, Al3+, CO32-, PO43-, NO3-, K3PO4, Al2(CO3)3, Ba(NO3)2.

Answer 2

Answer: a) $Ba(NO_3)_2$

b) $Al_2(CO_3)_3$

c) $K_3(PO_4)$

Explanation: A neutral compound is to be formed to get a stable compound. The charges have to be balanced , thus the valencies of ions are exchanged and the neutral compounds result.

These all are ionic compounds which result by complete transfer of electrons from metals to non metals.