How does indicator work during the determination of hardwater using Edta process
Muhammad Usman Mahmoud , 3 Years ago
Grade 12th pass
Inorganic Chemistry> How does indicator work during the determ...
2 AnswersYash Patari
Last Activity: 2 Years ago
dear student,
Thecombined concentration of calcium and magnesium ionsis considered to be the measure of water hardness. The method uses a very large molecule called EDTA which forms a complex with calcium and magnesium ions. ... The indicator is added and remains blue as all the Ca2+ and Mg2+ ions present are complexed with the EDTA.
Navneet jha
Last Activity: 2 Years ago
Eriochrome Black T is commonly used as indicator for the above titration. At pH 10,
Ca2+(aq) ion first complexes with the indicator as CaIn+(aq) which is wine red. As the
stronger ligand EDTA is added, the CaIn+(aq) complex is replaced by the CaY2-(aq)
complex which is blue. The end point of titration is indicated by a sharp colour change
from wine red to blue.
Titration using Eriochrome Black T as indicator determines total hardness due to Ca2+(aq)
and Mg2+(aq) ions. Hardness due to Ca2+(aq) ion is determined by a separate titration at
a higher pH, by adding NaOH solution to precipitate Mg(OH)2(s), using
hydroxynaphthol blue as indicator.
Provide a better Answer & Earn Cool Goodies
Enter text here...
LIVE ONLINE CLASSES
Prepraring for the competition made easy just by live online class.
Full Live Access
Study Material
Live Doubts Solving
Daily Class Assignments
Ask a Doubt
Get your questions answered by the expert for free
Enter text here...
Other Related Questions on Inorganic Chemistry
Total number of structural isomers of [Co(NH3)6][Cr(CN)6]
Inorganic Chemistry
0 Answer Available
Last Activity: 2 Year ago(s)
Why is boiling point of Cesium higher than that of Rubidium
Inorganic Chemistry
1 Answer Available
Last Activity: 2 Year ago(s)
which isomer mentioned in (a) is water soluble and why?
Inorganic Chemistry
1 Answer Available
Last Activity: 2 Year ago(s)
A gaseous mixture contains CO2 and CO the mass of the mixture is 200g and they are presenting equal fraction of moles . Find the total no. of O-atoms present in the mixture.
Inorganic Chemistry
0 Answer Available
Last Activity: 2 Year ago(s)
a gaseous mixture contains O2 , N2 and He in equal fraction of moles . Find the mass of He if 28g of N is present and 32g of O is present.
Inorganic Chemistry
0 Answer Available
Last Activity: 2 Year ago(s)