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evanwall91
14.04.2020 •
Chemistry
A sample of human blood was tested and found to have a pH of 7.43. Calculate [H3O+] and [OH-].
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Ответ:
(H30+)= 3,72 x 10 ^-8 M and (OH-)=2,69 x 10^-7 M
Explanation:
PH indicates the acidity or basicity of a substance. PH values between 0 and less than 7 indicate acidic solutions, 7 neutral and higher than 7 to 14 basic. It is calculated as
pH = -log (H 30+)
We solve: (H30)= antilog -pH= antilog -7.43
(H30+)= 3,72 x 10 ^-8 M
Both pH and pOH have a relationship to belonging to the same aqueous solution: the expression of the Kwater (ionic product of the water Kw) is used:
(H3O +) x (OH -) = 1x10 ^ -14
3,72 x10^-8 x(OH-)=1x10 ^ -14
(OH-) =1x10 ^ -14/3,72 x10^-8
(OH-)=2,69 x 10^-7 M
Ответ:
when the pressure is lower the boiling point is lower
Explanation: