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Can pH be a negative number?

Updated: 9/16/2023
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Yes, if the concentration of hydrogen ions is above 1 M, then pH will be negative. An example is Sulfuric acid, which can get a proton concentration up to 18 M which would be a pH of -1.3.

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Q: Can pH be a negative number?
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What are the units for measuring pH?

pH is a pure number. It doesn't have units. It is the negative log of the hydrogen ion concentration.


Why can't the pH of an aqueous solution be less than 0?

The pH of a solution can be less than zero. Remember that pH is defined as the negative logarithm of the hydronium ion concentration, pH = -log[H3O+]. For pH to be negative, the log of the hydronium ion concentration needs to be positive. The log of a number is only positive if that number is greater than one. For example, the value of log(2) is about 0.30. This means that the pH of a strong acid that has a concentration of greater than 1 molar will be negative.


Why is zero the lowest number on the pH scale?

Well...zero isn't really the lowest number on the pH scale. To simplify things, we teach kids that the scale goes from 0-14, but in reality, a solution can have a negative pH. The pH is the negative log of the hydrogen concentration or -log[H+]. So for -log[H+] to be negative, log[H+] has to be positive; therefore, [H+] would have to be greater than one. A solution that has a negative pH is extremely acidic! For example, a solution with a hydrogen concentration of 2.2 M would have a pH of -log[2.2] = -0.342 The reason we use 0-14 in abstraction is because pH + pOH = 14


What is the pH scale which way in acid which way is alkaline?

pH is the Negative power of H+ ions so "neutral" is ten to the minus 7th power (or pH=7) so acid is a Lower number and alkaline is a Higher number.


Can the pH of sulfuric acid be below 0?

Yes. An acid will have a negative PH under the circumstance that it is a strong acid as well as it has a concentration of over 1 mol/L as using the function -log(H3O+)... If a number above 1 is entered, it will yield a negative number.


How will you classify a substance having pH value negative?

Classify a substance that has negative pH value. Foods that have acids in them is a substance hat have pH.


What happens to the hydrogen ion concentration as you decrease the pH?

Hydrogen ion concentration increases.


How does one calculate the pH of the solution?

The pH is the negative log of [H+].


What is the pH of iron?

Iron does not have a pH on its own. pH is the negative log concentration of H+. Iron can be affected by pH though.


PH is the negative logarithm of the?

hydrogen


What does -log represent in the pH formula?

It is the negative value of the 10-base logarithmof [positive real number](cf. mathematics)


What are characteristics of pH?

pH is the negative logarithm of the hydrogen ion activity in a solution.