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20 cm3 = 0,02 dm3
0,1103 mol/dm3 * 0,02 dm3 = 0,002206 mola Na2CO3 =
0,002206 x
Na2CO3 + H2SO4 --> Na2SO4 + CO2 + H2O
106 98
x= 0,002206*98/106 = 0,00203950943 mola H2SO4
22,3cm3 = 0,0223 dm3
Cm= 0,00203950943/0,0223 = 0,09146 mol/dm3