Molar Ratio of Titration (1 Viewer)

[unano]

hey guys just having a little trouble understanding the molar ratio in titration calulations. like if the molar ratio of acid to base is 2:1 which one do i times by 2 when calculating number of moles. heres an e.g. questions:

What is the concentration of H2SO4 if 29mL is required to neutralise 25.00mL of 0.2mol/L NaHCO3.

the equation would be:

H2SO4 + 2NaHCO3 ------> Na2SO4 + 2H2O + 2CO2

so what do i do from here?
thanks guys

 

[Pwnage101]

1. Find n(NaHCO3) by using n=cv

2. Find n(H2SO4) by dividing n(NaHCO3) by 2

3. Find c(H2SO4) by using c=n/v

 

[Viru10]

yeh so in this case by the equation;

2 x number of moles of acid = number of moles of base
(because in the balanced equation, the Na2Co3 has twice the number of moles)

hence number of moles of acid = number of moles of base/2

Then its just the normal calculations after to calculate conc. of acid using: C = n/v.

Hope this helps