Consider the
concentration of the standard sodium carbonate solution is
c moldm-3 and
v mL of
hydrochloric acid is required to neutralize 25 mL of this standard sodium carbonate solution.
The reaction that occurs is:
2 HCl + Na2CO3 ~ 2 NaCl + H2O + CO2
From the above reaction it is clear that the neutralization of
1 mole of sodium
carbonate requires
2 moles of hydrochloric acid.
25 mL of the carbonate solution used contains
25c divided by 1000 = moles of sodium carbonate.
Therefore the neutralization requires
25cx2 divided by 1000 = moles of hydrochloric acid.
Hence, find the
concentration of the hydrochloric acid solution