HCl 0.1x30/1000 =0.003mol
NaOH 0.1x10/1000=0.001 mol
0.003-0.001=0.002 mol HClが反応しないで残る
水を加えて200mL=0.2Lなので
HClのモル濃度は 0.002/0.2=0.01 mol/L
[H+]も0.01 mol/L
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