quizzes 2 return submit 10 fill in the blank 3.7 points determine whether a substance with the following…

quizzes 2 return submit 10 fill in the blank 3.7 points determine whether a substance with the following concentration is acidic, basic or neutral according to the ph scale. 0.0004 m choose your answer... choose your answer... acidic 11 neutral basic e sure to click right in the middle of the molecule you choose. keyboard controls are available while using the hotspot. press s to use the arrow keys to move it, press d to save the

quizzes 2 return submit 10 fill in the blank 3.7 points determine whether a substance with the following concentration is acidic, basic or neutral according to the ph scale. 0.0004 m choose your answer... choose your answer... acidic 11 neutral basic e sure to click right in the middle of the molecule you choose. keyboard controls are available while using the hotspot. press s to use the arrow keys to move it, press d to save the

Answer

Explanation:

Step1: Recall pH - formula

The formula for pH is $pH = -\log[H^+]$, where $[H^+]$ is the hydrogen - ion concentration. Here, $[H^+]=0.0004\ M = 4\times10^{-4}\ M$.

Step2: Calculate pH

$pH=-\log(4\times 10^{-4})$. Using the logarithm property $\log(ab)=\log a+\log b$, we have $pH = -(\log4+\log(10^{-4}))$. Since $\log(10^{-4})=-4$ and $\log4\approx0.6021$, then $pH=-(0.6021 - 4)=3.3979$.

Step3: Determine acidity

On the pH scale, if $pH < 7$, the solution is acidic; if $pH = 7$, the solution is neutral; if $pH>7$, the solution is basic. Since $3.3979<7$, the solution is acidic.

Answer:

acidic