[HCO31 Strong acid pulse H [H2CO31 Strong base pulse 20 eg.24/l.2or40/2or10/0.5) ≠ (<20/1or>20/1)[HCO3 - ] [H2CO3 ] 20 1 pH ∝ Strong acid pulse Strong base pulse 20 1 ≠ ＝ ( eg . 24/1.2 or 40/2 or 10/0.5) ( ＜20/1 or ＞20/1 )