Question

find the ph of a solution if the hydrogen - ion concentration, h⁺, is 4.23×10⁻⁴ moles per liter. use the formula ph = - log (h⁺). a 3.4 b 3.6 c 3.8 d 4.2

Explanation:

Step1: Recall pH formula

$pH =-\log[H^+]$

Step2: Substitute given $H^+$ concentration

$[H^+]=4.23\times 10^{-6}$, so $pH =-\log(4.23\times 10^{-6})$

Step3: Use logarithm properties

$-\log(4.23\times 10^{-6})= - (\log4.23+\log(10^{-6}))$. Since $\log(10^{-6})=-6$ and $\log4.23\approx0.626$, then $pH=- (0.626 - 6)$

Step4: Calculate pH value

$pH = 6 - 0.626=5.374\approx5.4$

Answer:

A. 5.4