Answer:
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I think 1 option okkkkkkkkkkkkk
Explanation:
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PH=-lg[H⁺]
pH=-lg(2.8×10⁻⁹)=8.553
pOH=14-pH
pOH=14-8.553=5.447
[OH⁻]=10^(-pOH)
[OH⁻]=10⁻⁵·⁴⁴⁷=3.6×10⁻⁶
Heat flows from high temperature to low temperature
