- #1
Clari
- 62
- 0
Hello! Here is a acid-base titration question which I am a bit confused at, please help me with it.
If 25cm^3 solution containing 0.5M sodium carbonate and 0.5M sodium hydrogencarbonate is titrated with 1M HCl using phenolphthalein indicator. Upon the addition of 12.5cm^3 HCl, the phenolphthalein is decolourized. After the 1st end point, methyl orange indicator is added and the solution is further titrated with HCl. What is the volume of HCl needed the change the colour of methyl orange from yellow to orange?
My teacher told me it was 37.5 cm^3, but I don't understand it. I think it is 25 cm^3...
If 25cm^3 solution containing 0.5M sodium carbonate and 0.5M sodium hydrogencarbonate is titrated with 1M HCl using phenolphthalein indicator. Upon the addition of 12.5cm^3 HCl, the phenolphthalein is decolourized. After the 1st end point, methyl orange indicator is added and the solution is further titrated with HCl. What is the volume of HCl needed the change the colour of methyl orange from yellow to orange?
My teacher told me it was 37.5 cm^3, but I don't understand it. I think it is 25 cm^3...