UPSC Combined Geo-Scientist, Mains · 2018 · Mains Paper III
Q3(a). HCl and H₃PO₄ in a mixture by two end points
Question
A mixture of HCl and H₃PO₄ is titrated with 0.1000 M NaOH. The first end point (methyl red) occurs at 35.00 mL, and the second end point (bromothymol blue) occurs at a total of 50.00 mL. Calculate the millimoles of HCl and H₃PO₄ present in the solution.
Model answer
The free solution for 2018 answers questions 1, 4, 5, 6, 7 and 10, the ones picked in its time plan. This part is not answered on the site yet. New answers are announced on Telegram.
Part of VKC Basic
Read the key points and the full model answer with VKC Basic
VKC Basic (₹999 for 6 months) opens every solved answer, the notes, the handbook and the daily answer archive. Every Mains test series includes it.
Coversmixture titrationphosphoric acidtwo end pointsmethyl red bromothymol blue
All parts of Question 3
- 3(a) HCl and H₃PO₄ in a mixture by two end points10 marks
- 3(b) Sample weight of pyrite for a BaSO₄ factor weight10 marks
- 3(c)(i) Why the wash liquid is an electrolyte5 marks
- 3(c)(ii) Solubility of AgCl in 0.1 M NaNO₃5 marks