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[ÇóÖú] buffers and ionic strength

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PH=1-2 HCL-KCL
PH=3-7 ÄûÃÊËá-Na2HPO4
PH=8-9 Na2B4O7-HCL
PH=10-11 NaHCO3-NaOH
PH=12-13 KCL-NaOH
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