Question

check all that apply

• if the ratio of protons (h⁺) to hydroxide ions (oh⁻) is ten to one (10:1), then the solution is acidic.
• if the ratio of protons (h⁺) to hydroxide ions (oh⁻) is one to ten (1:10), then the solution is acidic.
• adding a base to an acidic solution will bring the ph of the solution closer to 7.
• acidic compounds are those that release protons (h⁺) into solution.

Explanation:

1. For the first statement: In an acidic solution, the concentration of $\text{H}^+$ ions is greater than that of $\text{OH}^-$ ions. A ratio of $\text{H}^+$ to $\text{OH}^-$ being $10:1$ means more $\text{H}^+$, so the solution is acidic.
2. For the second statement: Bases are substances that can neutralize acids. Adding a base to an acidic solution (which has a pH less than 7) will react with the acid, reducing the concentration of $\text{H}^+$ ions and thus bringing the pH closer to 7 (neutral).
3. For the third statement: By definition, acidic compounds (Arrhenius acids) are substances that dissociate in solution to release $\text{H}^+$ ions (protons).

Answer:

• If the ratio of protons ($\text{H}^+$) to hydroxide ions ($\text{OH}^-$) is ten to one ($10:1$), then the solution is acidic. (Checked)
• Adding a base to an acidic solution will bring the pH of the solution closer to 7. (Checked)
• Acidic compounds are those that release protons ($\text{H}^+$) into solution. (Checked)