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pH of acids

Posted: Sat Dec 08, 2018 7:09 pm
Why does a strong acid have a smaller pH compared to a weak acid that has a higher pH?

Re: pH of acids

Posted: Sat Dec 08, 2018 7:30 pm
Take a a look at this scale. The lower the PH, the more acidic it is. Thus, the stronger the acid, the lower its PH.

Re: pH of acids

Posted: Sun Dec 09, 2018 9:15 am
The lower the pH the stronger the acid!

Re: pH of acids

Posted: Sun Dec 09, 2018 9:21 am
You have to remember that pH is defined as -log[H3O+]. If [H3O+]=10^-5, then the pH is 5. If [H3O+]=10^-2, which is a higher concentration and therefore more acidic, then the pH is 2, which is smaller than 5.

Re: pH of acids

Posted: Sun Dec 09, 2018 10:16 am
if the pH is lower then the acid is stronger, I feel like its just something you kinda have to know

Re: pH of acids

Posted: Sun Dec 09, 2018 7:04 pm
The Ph of a strong acid is lower than that of a weak acid, however the concentration of H+ is greater.

Re: pH of acids

Posted: Mon Jan 21, 2019 1:37 pm
The pH is defined as the concentration of H+ ions within a solution by using the equation pH=-log[H+], so the higher the concentration of H+ ions within a solution indicates that the pH of the acid is lower and therefore stronger.

Re: pH of acids

Posted: Mon Jan 21, 2019 4:32 pm
It's just like a trend. Lower ph equates stronger acids while higher ones are weaker.

Re: pH of acids

Posted: Mon Jan 21, 2019 5:10 pm
Strong acid will have lower pH because it has a full dissociation into more H30+ than a weak acid. pH relies on the amount of H30+ ions (-logH30+) and so more H30+ ions will cause the pH to be lower since you are logging the molarity.

Re: pH of acids

Posted: Sun Dec 01, 2019 3:02 pm
The pH value is like a scale. From 0 to 14 it goes from more acid to more basic.

Re: pH of acids

Posted: Sun Dec 01, 2019 3:05 pm
The lower the pH is, the stronger the acid is. This is because pH decreases with the increase of H+ ion concentration, and a greater presence of H+ when compared to OH- indicates base-like properties.

Re: pH of acids

Posted: Mon Dec 02, 2019 8:31 am
The lower the pH is, the more H+ ions it has, making it more acidic. Higher pHs have a lower H+ concentration and are weaker acids.

Re: pH of acids

Posted: Mon Dec 02, 2019 11:10 am
Strong acids dissociate far more than weak acids do, which means that they release more hydrogen ions into the solution; this makes the solution more pH, since pH by definition is related to the inverse of the measure of hydrogen ions (the more hydrogen ions there are, the lower the pH is).

Re: pH of acids

Posted: Mon Dec 02, 2019 1:31 pm
A substance becomes more acidic as the pH decreases therefore the lower the pH the stronger the acid. The higher the pH the more basic the substance is therefore a substance with a higher pH will have be a weaker acid.