Question

question 14 · 1 point
what is the hydronium ion concentration of a solution at 25 °c with a poh of 4.70?
select the correct answer below:
○ 5.0×10^{-10} m
○ 1.9×10^{-5} m
○ 9.2×10^{-5} m
○ 9.0×10^{-3} m
content attribution
question 15 · 1 point
use the periodic table below to answer the question that follows.

Explanation:

Step1: Calculate pH

At \(25^{\circ}C\), \(pH + pOH=14\). Given \(pOH = 4.70\), then \(pH=14 - 4.70=9.3\)

Step2: Calculate \([H_3O^+]\)

Since \(pH=-\log[H_3O^+]\), then \([H_3O^+]=10^{-pH}\). Substituting \(pH = 9.3\), \([H_3O^+]=10^{-9.3}\). Using the property \(a^{m + n}=a^{m}\times a^{n}\), \(10^{-9.3}=10^{-10 + 0.7}=10^{0.7}\times10^{-10}\approx5\times10^{-10}\text{ M}\)

Answer:

A. \(5.0\times 10^{-10}\text{ M}\)