Table of common polyatomic ions with their chemical formulas and charges.

Actually, there is no explicit task or question written in the image you uploaded. The image simply displays a grid of 12 chemical species (ions), labeled from (a) to (l):

- (a) NH₄⁺
- (b) H₃O⁺
- (c) CN⁻
- (d) SCN⁻
- (e) CO₃²⁻
- (f) ClO₃⁻
- (g) SO₄²⁻
- (h) PO₄³⁻
- (i) SO₃²⁻
- (j) NO₂⁻
- (k) BF₄⁻
- (l) NO₃⁻

Since no instruction (e.g., “Classify as acid/base”, “Find conjugate pairs”, “Identify spectator ions”, etc.) is provided, I cannot solve a specific problem.

---

✔ However, here’s what I can do:

I’ll assume that the most likely intended task — based on common chemistry exercises involving such lists — is to:

> Classify each ion as either an acid, a base, or neither (spectator ion), based on its ability to donate or accept protons (Brønsted-Lowry definition).

---

## 🔍 Classification: Acid, Base, or Neither?

🧪 Definitions:

- Acid: Can donate a proton (H⁺).
- Base: Can accept a proton (H⁺).
- Neither: Does not significantly donate or accept protons in aqueous solution (spectator ion).

---

## 📋 Classification Table:

| Ion | Formula | Type | Reason |
|----------|------------|----------|--------|
| (a) NH₄⁺ | Ammonium | Acid | Donates H⁺ → NH₃ + H⁺ |
| (b) H₃O⁺ | Hydronium | Acid | Donates H⁺ → H₂O |
| (c) CN⁻ | Cyanide | Base | Accepts H⁺ → HCN |
| (d) SCN⁻ | Thiocyanate| Base | Weakly accepts H⁺ → HSCN |
| (e) CO₃²⁻| Carbonate | Base | Accepts H⁺ → HCO₃⁻ (and further to H₂CO₃) |
| (f) ClO₃⁻| Chlorate | Neither | Conjugate base of strong acid HClO₃ → very weak base, negligible reactivity |
| (g) SO₄²⁻| Sulfate | Neither | Conjugate base of strong acid H₂SO₄ (second proton) → very weak base |
| (h) PO₄³⁻| Phosphate | Base | Accepts H⁺ → HPO₄²⁻ → H₂PO₄⁻ → H₃PO₄ |
| (i) SO₃²⁻| Sulfite | Base | Accepts H⁺ → HSO₃⁻ → H₂SO₃ |
| (j) NO₂⁻ | Nitrite | Base | Accepts H⁺ → HNO₂ |
| (k) BF₄⁻ | Tetrafluoroborate | Neither | Very weak base; conjugate base of strong acid HBF₄ |
| (l) NO₃⁻ | Nitrate | Neither | Conjugate base of strong acid HNO₃ → no basicity |

---

## 🧠 Key Insights:

- Strong acid conjugate bases (like ClO₃⁻, SO₄²⁻, NO₃⁻, BF₄⁻) are very weak bases, often considered spectator ions.
- Weak acid conjugate bases (like CN⁻, CO₃²⁻, PO₄³⁻, NO₂⁻, SCN⁻, SO₃²⁻) are weak bases.
- Cations that can lose H⁺ (NH₄⁺, H₃O⁺) are acids.

---

## ✔ Final Answer (Assuming Task = Classify as Acid/Base/Neither):

| Ion | Type |
|-----|----------|
| (a) NH₄⁺ | Acid |
| (b) H₃O⁺ | Acid |
| (c) CN⁻ | Base |
| (d) SCN⁻ | Base |
| (e) CO₃²⁻| Base |
| (f) ClO₃⁻| Neither |
| (g) SO₄²⁻| Neither |
| (h) PO₄³⁻| Base |
| (i) SO₃²⁻| Base |
| (j) NO₂⁻ | Base |
| (k) BF₄⁻ | Neither |
| (l) NO₃⁻ | Neither |

---

⚠️ Note: If your actual task was different (e.g., “find conjugate acid-base pairs”, “identify polyatomic ions”, “predict solubility”, etc.), please provide the exact question — and I’ll solve it accurately!

Let me know if you’d like this explained differently or extended (e.g., with reactions or pH implications).