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Chemistry Forums for Students => Undergraduate General Chemistry Forum => Topic started by: chemicalLindsay on June 19, 2004, 04:36:04 AM

Title: ph
Post by: chemicalLindsay on June 19, 2004, 04:36:04 AM

I was just wondering cause all my books that I have explain ph really weirdly so I would just like a symplified version of ph (the strength of an acid or base) .I would like to also know how top calculate ph of acids and bases.

Title: Re:ph
Post by: Donaldson Tan on June 19, 2004, 11:52:42 AM

pH = - lg [H⁺]

pH is just a mathematical function of the concentration of the hydrogen ion.

Generally, at RTP, pH 7 is the neutral point. Above it is considered alkali, below it is considered acidic.

Title: Re:ph
Post by: AWK on June 20, 2004, 06:49:46 AM

Neutral point pH=7 slightly depends on temperature (this is for 22 C). At higher temperature neutral point is below pH=7,  at lower - slightly above pH=7.
PH=7 is commonly accpter for unprecised room temperature.

Title: Re:ph
Post by: chemicalLindsay on June 26, 2004, 04:45:53 AM

THANKS VERY MUCH

Title: Re:ph
Post by: Mitch on June 26, 2004, 05:23:45 PM

You can make your own ph indicator by boiling purple cabbage. You can then take that liquid and examine the phs of common house hold products.  8)