## Calculating the difference between two pH values

Toru Fiberesima 1L
Posts: 63
Joined: Fri Apr 06, 2018 11:02 am

### Calculating the difference between two pH values

How do you calculate the difference between two pH values of the same acid, just diluted. 12.9 is an example of a question that asks you to do this.

Thanks

Chem_Mod
Posts: 18880
Joined: Thu Aug 04, 2011 1:53 pm
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### Re: Calculating the difference between two pH values

I do not quite understand your question. However, determining the concentration (moles/L) of H+ and/or OH- is necessary to determine pH. For diluted solutions, the volume (L) may be different, yielding different concentrations of the ions.

NabilaNizam-1K
Posts: 30
Joined: Fri Apr 06, 2018 11:04 am

### Re: Calculating the difference between two pH values

I think you are trying to calculate the strength of the same type of acid (eg: HCl) before and after dilution. Since pH value is affected by the [H+], calculating the concentration of H+ in both solutions can give you the pH value by using

pH = -log[H+]

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