Calculating pH

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Nancy Le - 1F
Posts: 52
Joined: Fri Sep 29, 2017 7:07 am

Calculating pH

Postby Nancy Le - 1F » Sat Dec 02, 2017 5:02 pm

When calculating the logarithm to find the pH of a solution, why is there a negative sign?

Deborah Cheng 1F
Posts: 50
Joined: Thu Jul 13, 2017 3:00 am

Re: Calculating pH

Postby Deborah Cheng 1F » Sat Dec 02, 2017 5:04 pm

There is a negative sign so that we will arrive at positive values on the pH scale.

miznaakbar
Posts: 55
Joined: Thu Jul 13, 2017 3:00 am
Been upvoted: 4 times

Re: Calculating pH

Postby miznaakbar » Sat Dec 02, 2017 5:07 pm

From what i understand, the negative sign is just a way to ensure the pH is always a positive value. Generally, the concentration of ions is very small, so the value will be raised to a negative exponent. For instance, if you have a concentration of 1.0 x 10^-7, taking the negative log will give you positive 7.

Navleen Bajwa 3A
Posts: 20
Joined: Fri Sep 29, 2017 7:06 am

Re: Calculating pH

Postby Navleen Bajwa 3A » Fri Dec 08, 2017 1:08 am

The negative logarithm is used so that most pH values are positive numbers.


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