Question

Name the following polyatomic ions :

a. ${\mathrm{OH}}^{-}$ b. ${\mathrm{PO}}_4^{3-}$

c. ${\mathrm{CN}}^{-}$ d. ${\mathrm{NO}}_2^{-}$

Short answer

a. The name of the polyatomic ion ${\mathrm{OH}}^{-}$is hydroxide.

b. The name of the polyatomic ion ${\mathrm{PO}}_4^{3-}$is Phosphate.

c. The name of the polyatomic ion ${\mathrm{CN}}^{-}$is cyanide.

d. The name of the polyatomic ion${\mathrm{NO}}_2^{-}$is nitrite.

Step-by-step solution

Part (a) Step 1 : Given information

We have to write the name of ${\mathrm{OH}}^{-}$ polyatomic ion.

Part (a) Step 2 : Simplification

• The chemical name of the polyatomic ion is Hydroxide.
• Hydroxide is composed of$\mathrm{H}$(hydrogen) and$\mathrm{O}$(oxygen)

Part (b) Step 1 : Given information

We have to write the name of ${\mathrm{PO}}_4^{3-}$ polyatomic ion.

Part (b) Step 2 : Simplification

• The chemical name of the polyatomic ion is Phosphate.
• Phosphate is composed of$\mathrm{P}$(Phosphorus) and$\mathrm{O}$(oxygen)

Part (c) Step 1 : Given information

We have to write the name of ${\mathrm{CN}}^{-}$ polyatomic ion.

Part (c) Step 2 : Simplification

• The chemical name of the polyatomic ion is cyanide.
• Cyanide is composed of$\mathrm{C}$(carbon) and$\mathrm{N}$(nitrogen)

Part (d) Step 1 : Given information

We have to write the name of ${\mathrm{NO}}_2^{-}$ polyatomic ion.

Part (d) Step 2 : Simplification

• The chemical name of the polyatomic ion is nitrite.
• Nitrite is composed of $\mathrm{N}$(nitrogen) and $\mathrm{O}$(oxygen)