Chemistry, 31.08.2019 04:30 franvelpaulino2191
What is the ph of pure water at 40.0â°c if the kw at this temperature is 2.92 - 10-147 oa) 6.767 o b) 0 465 o c) 7.000 od) 7 233 o e) 8.446
Answers: 3
![[H_{3}O^{+} ] [OH^{-} ] = Kw = 2.92*10^{-14} M^{2} \\\\](/tpl/images/0213/9913/4fdb1.png)
![[H_{3}O^{+} ] = [OH^{-} ]](/tpl/images/0213/9913/b65d7.png)
![[H_{3}O^{+} ]^{2} = 2.92*10^{-14} M^{2}](/tpl/images/0213/9913/2d2d3.png)
![[H_{3}O^{+} ] = (2.92*10^{-14})^{1/2} = 1.71*10^{-7} M](/tpl/images/0213/9913/c8e2a.png)
![PH= -log10[H_{3}O^{+} ] = -log10(1.71*10^{-7} ) = 6.767](/tpl/images/0213/9913/49805.png)
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What is the ph of pure water at 40.0â°c if the kw at this temperature is 2.92 - 10-147 oa) 6.767 o b...
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