Question

The ph scale is a logarithmic scale corresponding to the h ion concentrations of aqueous solutions. the ph is equal to the negative logarithm (base 10) of the h ion concentration. ph = -log [h ] this equation be rearranged to calculate the h ion concentration based on given ph: [h ] = 10-ph a similar calculations can be used to find the poh from the [oh−]. at 25 °c, the ph and poh values are related by the equation ph poh = 14. what is the poh for a solution with [oh−] = 8.3 × 10-3 m

A) 4.7
B) 5.7
C) 9.3
D) 10.3

Answer 1

The pOH for a solution with [OH−] = 8.3 × 10−3 M is calculated using the formula pOH = -log [OH−]. After calculating, the pOH is approximately 2.08. The closest answer choice provided, assuming it was a mistake and the pH was being asked, is D) 10.3.

Step-by-step explanation:

To find the pOH of a solution with a given hydroxide ion concentration ([OH−]), we use the formula: pOH = -log [OH−]. For a solution with [OH−] = 8.3 × 10−3 M, we first calculate the pOH:

pOH = -log(8.3 × 10−3)

After performing the logarithmic calculation, we find that the pOH is approximately 2.08. To relate pOH to pH, we use the relationship at 25 °C: pH + pOH = 14. We can now calculate the pH using the pOH value:

14 - pOH = 14 - 2.08 = 11.92

However, the question requests the pOH, not the pH. Since we've already calculated the pOH, we can conclude that for a solution with [OH−] = 8.3 × 10−3 M, the pOH is 2.08, which is not listed in the provided options.

If this was a mistake and the answer choices provided were for pH rather than pOH, then the correct choice would be closest to pH, which is 11.92, so the correct answer would be option D) 10.3, assuming it was a rounding or transcription error in the multiple-choice options.