Question

Identify the acid, the base, the conjugate acid, and the conjugate base in the following equation: OH- + HCN --> H2O + CN- (4 points) True False HCN & CN- Acid & Conjugate Base OH- & H2O Acid & Conjugate Base HCN & CN- Base & Conjugate Acid OH- & H2O Base & Conjugate Acid

Answer 1

Let's analyze the reaction:

\[ \text{OH}^- + \text{HCN} \rightarrow \text{H}_2\text{O} + \text{CN}^- \]

1. **Identify the Acid and the Base**:
- HCN (hydrogen cyanide) acts as an acid because it donates a proton (H⁺).
- OH⁻ (hydroxide ion) acts as a base because it accepts a proton.

2. **Identify the Conjugate Acid and Conjugate Base**:
- After donating a proton, HCN becomes CN⁻ (cyanide ion), which is the conjugate base.
- After accepting a proton, OH⁻ becomes H₂O (water), which is the conjugate acid.

Now, let's summarize the findings:
- Acid: **HCN**
- Base: **OH⁻**
- Conjugate Acid: **H₂O**
- Conjugate Base: **CN⁻**

Now, let's validate the provided statements:
1. **HCN & CN⁻ Acid & Conjugate Base**: True
2. **OH⁻ & H₂O Acid & Conjugate Base**: False (OH⁻ is the base and H₂O is the conjugate acid)
3. **HCN & CN⁻ Base & Conjugate Acid**: False (HCN is the acid, not the base)
4. **OH⁻ & H₂O Base & Conjugate Acid**: True

So the correct statements are:
- HCN & CN⁻ Acid & Conjugate Base: **True**
- OH⁻ & H₂O Base & Conjugate Acid: **True**