2) At the endpoint:
2(no. mole of acid) = no. of mole of base
2(Molarity of acid*Volume of acid) = Molarity of base*volume of base
Trail 1: Molarity of acid *10/1000 = (0.5* 12.5/1000)/2
Molarity of acid =0.3125M
Trail 2: Molarity of acid *10/1000 = (0.5* 12.2/1000)/2
Molarity of acid = 0.305M
Trail 3: Molarity of acid *10/1000 = (0.5* 12.45/1000)/2
Molarity of acid = 0.31125M
3) 0.3125M + 0.305M + 0.31125M = 0.309 M
4) According to the above equation : Ratio between moles NaOH : H2SO4
2 : 1
At the endpoint:
2(no. mole of acid) = no. of mole of base
2(Molarity of acid*Volume of acid) = Molarity of base*volume of base
5)KOH + HCl ------------------ KCl + H2O
At the endpoint:
no. mole of acid = no. of mole of base
Molarity of acid*Volume of acid = Molarity of base*volume of base
M * 10.0/1000 = 30.0/1000 * 0.5
M = 1.5 M
6) H2SO4 + 2 NaOH ------------------- Na2SO4 + 2 H2O
At the endpoint:
2(no. mole of acid) = no. of mole of base
2(Molarity of acid*Volume of acid) = Molarity of base*volume of base
0.300 * 20.0 = 0.100 * V
V=120 / 1000 = 0.12 Liter
Conclusion:
The acid base titration is an experiment that needs to be controlled by indicator that shows the endpoint. This indicator was phenolphthalein and the color change is pink. Moles relationship has to be taken in consideration according to the theoretical equation. Accuracy has to be high in doing the experiment because it is a quantitative one.
Such experiments are very helpful in understanding concentrations of solutions and measuring volumes and relating that to moles.
Source of error:
- Inaccurate measurements of volumes
- Having impurities in the burette or flasks
- Exceeding the endpoint , this can be known by the color of the indicator
Improvements:
- Controlling the addition of the drops of base using a more advanced way
- Starting from zero always in each trail
by
nadeem10 (student)
