(a) Lemon juice was found to have a pH of 2.85. What is the concentration of hydronium ions in the juice?
 M

(b) An aqueous solution of baking soda was found to contain OH − ions at a concentration of 2.5 ✕ 10−6 M. What is its pOH value?


Let's solve each part step by step:

### Part (a) Lemon juice with pH 2.85

The concentration of hydronium ions \([H_3O^+]\) in a solution can be calculated using the pH value and the following formula:

\[
pH = -\log[H_3O^+]
\]

To find the concentration \([H_3O^+]\), we rearrange the formula:

\[
[H_3O^+] = 10^{-\text{pH}}
\]

Given that the pH is 2.85:

\[
[H_3O^+] = 10^{-2.85}
\]

Let's calculate this value.

\[
[H_3O^+] = 1.41 \times 10^{-3} \, M
\]

So, the concentration of hydronium ions in the lemon juice is approximately \( 1.41 \times 10^{-3} \, M \).

---

### Part (b) Aqueous solution of baking soda with OH⁻ concentration \( 2.5 \times 10^{-6} \, M \)

The pOH can be calculated using the formula:

\[
pOH = -\log[OH^-]
\]

Given that \([OH^-] = 2.5 \times 10^{-6} \, M\), we can substitute this into the formula:

\[
pOH = -\log(2.5 \times 10^{-6})
\]

Let's calculate this value.

\[
pOH = 5.60
\]

So, the pOH of the solution is approximately 5.60.

---

### Summary of results:
(a) \([H_3O^+]\) in lemon juice = \( 1.41 \times 10^{-3} \, M \)  
(b) pOH of baking soda solution = 5.60

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Do you need more details or have any questions?

Here are 5 related questions for further exploration:

1. What is the pOH value corresponding to a pH of 2.85?
2. How is the relationship between pH and pOH determined?
3. What is the pH of the baking soda solution, knowing the pOH value?
4. How do strong acids and weak acids differ in terms of their hydronium ion concentrations?
5. How does the pH of lemon juice compare to that of other common acidic foods?

**Tip**: Remember, pH and pOH are connected through the relationship \( pH + pOH = 14 \) for aqueous solutions at 25°C.

Lemon juice was found to have a pH of 2.85. What is the concentration of hydronium ions in the juice? An aqueous solution of baking soda was found to contain OH− ions at a concentration of 2.5 × 10−6 M. What is its pOH value?

Learn how to calculate the concentration of hydronium ions and the pOH value of a solution. This problem involves calculating the hydronium ion concentration for lemon juice with a pH of 2.85 and the pOH for a baking soda solution with OH⁻ concentration of 2.5 × 10−6 M. Suitable for students in Grades 9-11.

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