(a)[3]
Calculate the concentration of the Na_2CO_3(aq), in mol/dm^3, by carrying out these steps: Calculate how many moles of HCl were used in the titration. Calculate how many moles of Na_2CO_3 were present in the 25.0 cm^3 sample of Na_2CO_3(aq). Calculate the concentration of the Na_2CO_3(aq) in mol/dm^3.
(b)[1]
How many moles of CO_2 does this represent?
(c(i))[1]
Calculate the concentration of HBr(aq), in g/dm^3.
(c(ii))[2]
Explain why concentrated HBr(aq) is able to conduct electricity.
(c(iii))[1]
Explain why this is so.
(c(iv))[1]
Predict the product at the anode when concentrated HBr(aq) undergoes electrolysis.
(c(v))[2]
Write the ionic half-equation for the process at the cathode.