Question

use the formula $ph = -logh^+$, where $h^+$ represents the concentration of hydrogen ions in moles per liter. round to two decimal places. the normal ph level for streams and rivers is between 6.5 and 8.5. a high level of bacteria in a particular stream caused environmentalists to test the water. the level of hydrogen ions was found to be 0.008 mol/l. what is the $ph$ level of the stream? the $ph$ level of the stream is approximately $square$.

Explanation:

Step1: Identify the formula and given value

The formula for pH is \( pH = -\log[H^+] \), and the given hydrogen ion concentration \([H^+] = 0.008\) mol/L.

Step2: Substitute the value into the formula

Substitute \([H^+] = 0.008\) into the formula: \( pH = -\log(0.008) \).

Step3: Calculate the logarithm

Using a calculator, \(\log(0.008) \approx -2.09691\). Then, \( pH = -(-2.09691) = 2.09691 \).

Step4: Round to two decimal places

Rounding \( 2.09691 \) to two decimal places gives \( 2.10 \).

Answer:

2.10