Question

A chemist is using a solution of HNO3 that has a pH of 3.75.

What is [H+] for the solution?

____ ⇒ *1.78* × 10^n M
n = ____ *-4*

Okay so I don't Get chemistry and I'm getting a tutor eventually. the blank is what i had to fill in and the arrows are pointing to a number in as-tricks these are the correct answer. However I wish for an explanation. on where this number came from i know I'm suppose to use a calculator and i know i use the "log" button However What do i throw in it. (err 75 points instead of cause I don't just want an answer just a logical explanation. THANK YOU SO MUCH!)

Answer 1

what you have to keep in mind is that 
pH   =  - log[H+]
so 3.75 = -log[H+], we get [H+]=$10^{-3.75}$,
that is [H+]≈1.77827941×$10^{-4}$(i see this result on calculator)
this is just what you want!

Answer 2

Considering the definition of pH, the concentration [H⁺] is  1.7783×10⁻⁴ M.

Definition of pH

You need to know that pH is the Hydrogen Potential. It is a measure of acidity or alkalinity that indicates the amount of hydrogen ions present in a solution or substance.

Mathematically, pH is calculated as the negative base 10 logarithm of the activity of hydrogen ions:

pH= - log [H⁺]

The numerical scale that measures the pH of substances includes the numbers from 0 to 14. The pH value 7 corresponds to neutral substances. Acidic substances are those with a pH lower than 7, while basic substances have a pH higher than 7.

[H⁺] for a solution of HNO₃ that has a pH of 3.75

In this case, being pH= 3.75, you can replace this value in the definition of pH:

3.75= -log [H⁺]

Solving:

[H⁺]= 10⁻³ ⁷⁵ M

[H⁺]= 1.7783×10⁻⁴ M

Finally, the concentration [H⁺] is  1.7783×10⁻⁴ M.

Learn more about pH:

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