2(1-V2)×AO NaoH%o= 100 S样 (Na2CO3) CmC×2V2×-2 Na, CO3 1000 ×100 S样5 1000 100% ( ) % 1 2  −  = S样 M C V V NaOH NaOH HCl 1000 100% M 2 Na CO ) 2 1 ( 2 2 3 2 3    = S样 C V Na CO HCl