Pure water consits almost entirely of _______ (ions/molecules ).

Explanation

**Step-by-Step Solution:**

1. **Understanding the Composition of Water:**
- Water is a chemical compound with the formula H₂O, which means each molecule of water consists of two hydrogen atoms and one oxygen atom.

2. **Defining Pure Water:**
- Pure water is often defined as water that contains no impurities or dissolved substances. In its pure state, water primarily exists as H₂O molecules.

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