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Posted: Thu Dec 06, 2018 11:08 am
by paytonm1H
Does the pH of water increase or decrease with increasing temperature? Why?

Re: Water

Posted: Thu Dec 06, 2018 2:10 pm
by 905109118
pH decreases with increase in temperature. But this does not mean that water becomes more acidic at higher temperatures. In the case of pure water, there are always the same concentration of hydrogen ions and hydroxide ions and hence, the water is still neutral (even if its pH changes)

Re: Water

Posted: Thu Dec 06, 2018 2:20 pm
by Catly Do 2E
When we increase the temperature, water's ability to ionize increases, so [H+] increases, which means pH decreases. Essentially, a record of a pH value without a corresponding temperature value is not enough information in something like a lab report. If it is just water by itself, I don't think temperature will affect the pH level of water; I believe pure H2O will always be pH 7.