Just before 1800, most acid–base titrations employed H2SO4, HCl, or HNO3 as acidic titrants, and K2CO3 or Na2CO3 as basic titrants. A titration’s finish point was determined using litmus as an indicator, and that is red in acidic methods and blue in basic alternatives, or via the cessation of CO2 effervescence when neutralizing CO32–.Acid-bas
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