Question

Which substances are acids? Check all that apply.

AgOH
HF
NiOOH
NH4OH
HMnO4
Zn(OH)2

Answer 1

To identify which substances are acids, let's briefly describe each one:

1. **AgOH** - Silver hydroxide; this is a base.
2. **HF** - Hydrofluoric acid; this is an acid.
3. **NiOOH** - Nickel oxyhydroxide; typically acts as a base.
4. **NH4OH** - Ammonium hydroxide; this is a base (it's often considered a solution of ammonia in water).
5. **HMnO4** - Permanganic acid; this is an acid.
6. **Zn(OH)2** - Zinc hydroxide; this is a base.

Based on this analysis, the substances that are acids are:

- **HF (Hydrofluoric acid)**
- **HMnO4 (Permanganic acid)**

So, check **HF** and **HMnO4** as acids.