剩余沉淀2.33g是BaSO4,物質(zhì)的量是n=m/M=2.33/233=0.01mol
Na2SO4的物質(zhì)的量也是0.01mol,質(zhì)量是m=nM=0.01*142=1.42g
Na2CO3的質(zhì)量是2.056-1.42=0.636g,質(zhì)量分?jǐn)?shù)是0.636/2.056*100%=31%
Na2CO3的物質(zhì)的量是n=0.636/106=0.006mol
Na2CO3+2HCl=2NaCl+H2O+CO2↑
1 1
0.006mol n
n=0.006mol
CO2的體積是V=n*Vm=0.006*22.4=0.1344L=134.4mL
Na2SO4、Na2CO3與BaCl2都是1：1反應(yīng),所以Na2SO4、Na2CO3的總的物質(zhì)的量就是BaCl2的物質(zhì)的量,是0.006+0.01=0.016mol
BaCl2的物質(zhì)的量濃度是c=n/V=0.016/0.01=0.16mol/L
答：1.原碳酸鈉質(zhì)量分?jǐn)?shù)是31%
2.標(biāo)況下生成氣體134.4mL
3氯化鋇溶液物質(zhì)的量的濃度是0.16mol/L是1.6mol/l其他都OK