PH and pOH Knowledge-Based Download PDF

Questions

1. 1.

   At an elevated temperature, the ion-product constant of water, $K_w$, is $1.0 \times 10^{-12}$. What is the pH of an aqueous solution at this temperature with a hydroxide ion concentration of $1.0 \times 10^{-4}\text{ M}$?

   • A) 10.00
   • B) 8.00
   • C) 6.00
   • D) 4.00
2. 2.

   An aqueous strong acid solution has a pH of 3.00 at 25 °C. If a 10.0 mL sample of this solution is diluted with pure water to a final volume of 1.00 L, what is the pOH of the diluted solution?

   • A) 5.00
   • B) 7.00
   • C) 9.00
   • D) 11.00
3. 3.

   At 25 °C, an aqueous solution has a pH value that is 4.00 units greater than its pOH value. What is the hydronium ion concentration, $[\text{H}_3\text{O}^+]$, of this solution?

   • A) $1.0 \times 10^{-9}\text{ M}$
   • B) $1.0 \times 10^{-5}\text{ M}$
   • C) $1.0 \times 10^{-4}\text{ M}$
   • D) $1.0 \times 10^{-10}\text{ M}$
4. 4.

   In an aqueous solution at 25 °C, the ratio $[\text{H}_3\text{O}^+] / [\text{OH}^-]$ is equal to $1.0 \times 10^4$. What is the pH of this solution?

   • A) 5.0
   • B) 9.0
   • C) 4.0
   • D) 10.0
5. 5.

   At 25 °C, an aqueous solution has a hydroxide ion concentration of $2.0 \times 10^{-4}\text{ M}$. Given that $\log 2 \approx 0.30$, what is the pH of this solution?

   • A) 3.70
   • B) 10.30
   • C) 9.70
   • D) 4.30