A wildlife biologist in Nova Scotia is testing the pH of stream water. She hopes that the pH of the water is greater than 5.5 so that Atlantic Salmon returning this year to their natal streams will be able to reproduce. The hydrogen ion concentration of the water is 0.0000019 moles per liter. To the nearest tenth, what is the pH of the water?
it would be -log(.0000019), right? but what does that equal to?
pH = -log(H^+) = -log(1.9 x 10^-6) = -(-5.72) = 5.72. To the nearest tenth, that would be pH = 5.7.
If you don't know how to plug that into your calculator, just enter 0.0000019 and hit the log button. The answer will be -5.72 and you multiply that by -1 which changes the number to a positive number.
never mind..i actually figured this out.
Yes, you are correct! To calculate the pH of the water, you need to take the negative logarithm (base 10) of the hydrogen ion concentration.
Using the formula -log[H+], where [H+] is the hydrogen ion concentration of 0.0000019 moles per liter, you would calculate it as:
pH = -log(0.0000019)
Calculating the value using a scientific calculator, the pH is approximately 5.7 to the nearest tenth.
Yes, you are correct. To find the pH of the water, you can use the equation pH = -log[H+], where [H+] represents the hydrogen ion concentration. In this case, the hydrogen ion concentration is 0.0000019 moles per liter.
So, plugging in the values into the formula, the calculation would be:
pH = -log(0.0000019)
To solve this, you would need to use a logarithm calculator or the logarithm function on a calculator. By entering the value 0.0000019, you should get an answer of approximately 5.7.
Therefore, to the nearest tenth, the pH of the water is 5.7.