Discussion
In the EDTA method of estimating hardness, the indicator used is
Answer: A
Correct answer: Eriochrome Black T
Eriochrome Black T forms a wine-red complex with calcium and magnesium ions. As EDTA is added it takes the metal ions away, because the EDTA complex is the more stable, and at the end point the free indicator is released, turning the solution steel blue. Phenolphthalein and methyl orange are acid-base indicators and starch is for iodine.
No comment is present. Be the first to comment.
Loading…
Post your comment
Please log in or register to post a comment.
Examination Categories
- SSC Exams
- Banking Exams
- Teaching Exams
- Civil Services Exams
- Railways Exams
- Engineering Recruitment Exams
- Defence Exams
- State Government Exams
- Police Exams
- Insurance Exams
- Nursing Exams
- Other Government Exams
- NRA CET
- PG Entrance Exams
- Campus Placement
- MBA Entrance Exams
- CUET and UG Entrance
- Judiciary Exams
- Regulatory Body Exams
- Software Development