Na+物质的量:(CH3COO-+CH3COOH)的物质的量=10*0.1:20*0.1=1:2
在体积相同的情况下,同除以体积,则c(Na+):c(CH3COO-+CH3COOH)=1:2
即c(CH3COO-+CH3COOH)=2c(Na+)