Question

Use the equation pH=−log(H + ), where H + is the hydrogen ion concentration of a solution. Find the pH of a baking soda solution for which the hydrogen ion concentration is 2.43 ✕ 10^−3. (Round to the nearest tenth.)

a) pH = 2.6
b) pH = 3.0
c) pH = 3.6
d) pH = 3.4

Answer 1

Using the pH equation pH = -log[H+], and plugging in the given hydrogen ion concentration of 2.43 × 10^{-3}, the pH is calculated to be approximately 2.6 when rounded to the nearest tenth, corresponding to option a.

Step-by-step explanation:

To find the pH of a baking soda solution with hydrogen ion concentration of 2.43 × 10^{-3}, we use the equation:

pH = -log[H+]

Substituting the given concentration into the equation:

pH = -log(2.43 × 10^{-3})

Using a scientific calculator to compute the logarithm, we get:

pH ≈ -log(2.43 × 10^{-3}) ≈ -(-2.614897216)

Therefore, the pH is approximately:

pH ≈ 2.6 (rounded to the nearest tenth)

So, the correct answer is option a) pH = 2.6