Acid-base indicator
In acid-base titration, the sudden change in color of acid-base indicator is used to indicate the end point of titration. Acid-base indicator usually is a weak organic acid or an organic weak base. In alkaline solution, the indicator lost protons that it changes from the acid to basic (expressed in In-), and give protons in acidic solution changing from the basic to acid (expressed in HIn), accompanied by changes of structure and color. Since the equilibrium constants KHlπ are different from variety of indicators, the color range is different. Some discoloration happens in an acidic solution, some happens in the vicinity of neutral, some discoloration occurs in an alkaline solution. Thus, you can select the appropriate acid-base indicator based on acid-base titration equivalence point of pH value and the jump range. For example, strong base titrate weak acid, etc. the solution appear weak alkaline at the titration endpoint, pH leap is also included in the alkaline range near the titration endpoint, and the choice of thymol blue or phenolphthalein indicator is correct, while the methyl orange which change color in an acidic solution is not proper. On the contract, strong acid weak base titration, the solution appear weak acidic at the titration endpoint, pH leap is also included in the acidic range near the titration endpoint. The choice of methyl red, methyl orange and bromine cresol green indicator are very appropriate.
Click on the specific product, view the latest prices of the products, information, serving information
- Structure:
- Chemical Name:
- Bismuththiol
- CAS:
- 1072-71-5
- MF:
- C2H2N2S3
- Structure:
- Chemical Name:
- 1,10-Phenanthroline hydrate
- CAS:
- 5144-89-8
- MF:
- C12H8N2.H2O
- Structure:
- Chemical Name:
- Methyl Red sodium salt
- CAS:
- 845-10-3
- MF:
- C15H16N3NaO2
- Structure:
- Chemical Name:
- 2,6-DINITROPHENOL
- CAS:
- 573-56-8
- MF:
- C6H4N2O5
- Structure:
- Chemical Name:
- BCP
- CAS:
- 62625-30-3
- MF:
- C21H17Br2NaO5S
- Structure:
- Chemical Name:
- Alizarin Complexone
- CAS:
- 3952-78-1
- MF:
- C19H15NO8
- Structure:
- Chemical Name:
- Cresol Purple
- CAS:
- 2303-01-7
- MF:
- C21H18O5S
- Structure:
- Chemical Name:
- ROSOLIC ACID
- CAS:
- 603-45-2
- MF:
- C19H14O3
- Structure:
- Chemical Name:
- alpha-Naphtholphthalein
- CAS:
- 596-01-0
- MF:
- C28H18O4
- Structure:
- Chemical Name:
- Mordant Orange 1
- CAS:
- 2243-76-7
- MF:
- C13H9N3O5
- Structure:
- Chemical Name:
- Methyl Red
- CAS:
- 493-52-7
- MF:
- C15H15N3O2
- Structure:
- Chemical Name:
- Tetrabromophenol Blue
- CAS:
- 4430-25-5
- MF:
- C19H6Br8O5S
- Chemical Name:
- METHYL PURPLE
- CAS:
- 1340-02-9
- MF:
- C67H62N8Na4O14S3
- Structure:
- Chemical Name:
- 4-(2-PYRIDYLAZO)RESORCINOL
- CAS:
- 1141-59-9
- MF:
- C11H9N3O2
- Structure:
- Chemical Name:
- 4-(4-ETHOXYPHENYLAZO)-M-PHENYLENEDIAMINE MONOHYDROCHLORIDE
- CAS:
- 2313-87-3
- MF:
- C14H17ClN4O
- Structure:
- Chemical Name:
- α-Naphthoflavone
- CAS:
- 604-59-1
- MF:
- C19H12O2
- Structure:
- Chemical Name:
- N,N'-Diphenylbenzidine
- CAS:
- 531-91-9
- MF:
- C24H20N2
- Structure:
- Chemical Name:
- 2-Nitrophenol Sodium Salt
- CAS:
- 824-39-5
- MF:
- C6H6NNaO3
- Structure:
- Chemical Name:
- LACMOID
- CAS:
- 42249-61-6
- MF:
- C12H7NO3.H3N
- Structure:
- Chemical Name:
- M-CRESOL PURPLE, SODIUM SALT
- CAS:
- 62625-31-4
- MF:
- C21H17NaO5S
- Structure:
- Chemical Name:
- PHENOLPHTHALEIN DISODIUM SALT
- CAS:
- 518-51-4
- MF:
- C20H15NaO4
- Chemical Name:
- BUFFER SOLUTION PH 7.00
- Structure:
- Chemical Name:
- 2，9-dibromo-1,10-phenanthroline
- CAS:
- 39069-02-8
- MF:
- C12H6Br2N2
- Structure:
- Chemical Name:
- Chlorophenol Red
- CAS:
- 4430-20-0
- MF:
- C19H12Cl2O5S
- Structure:
- Chemical Name:
- Pigment Blue 61
- CAS:
- 1324-76-1
- MF:
- C37H29N3O3S
- Structure:
- Chemical Name:
- 3-Nitrophenol
- CAS:
- 554-84-7
- MF:
- C6H5NO3
- Structure:
- Chemical Name:
- 2-Nitrophenol
- CAS:
- 88-75-5
- MF:
- C6H5NO3
- Structure:
- Chemical Name:
- 3,8-Dibromo-1,10-phenanthroline
- CAS:
- 100125-12-0
- MF:
- C12H6Br2N2
- Chemical Name:
- LITMUS
- CAS:
- 1393-92-6
- MF:
- n.a.
- Structure:
- Chemical Name:
- Curcumin
- CAS:
- 458-37-7
- MF:
- C21H20O6
- Structure:
- Chemical Name:
- ZINCON
- CAS:
- 135-52-4
- MF:
- C20H16N4O6S
- Structure:
- Chemical Name:
- TETRABROMOPHENOLPHTHALEIN ETHYL ESTER POTASSIUM SALT
- CAS:
- 62637-91-6
- MF:
- C22H13Br4KO4
- Structure:
- Chemical Name:
- CYANINE
- CAS:
- 523-42-2
- MF:
- C29H35IN2
- Structure:
- Chemical Name:
- o-Phenanthroline
- CAS:
- 66-71-7
- MF:
- C12H8N2
- Structure:
- Chemical Name:
- ALLOXAN TETRAHYDRATE
- CAS:
- 6010-91-9
- MF:
- C4H10N2O8
- Structure:
- Chemical Name:
- Mordant Yellow 1
- CAS:
- 584-42-9
- MF:
- C13H10N3NaO5
- Structure:
- Chemical Name:
- p-Naphtholbenzein
- CAS:
- 145-50-6
- MF:
- C27H18O2
- Chemical Name:
- IODIDE-STARCH SOLUTION
- CAS:
- 9010-71-3
- Structure:
- Chemical Name:
- 2,2'-Bipyridine
- CAS:
- 366-18-7
- MF:
- C10H8N2
- Chemical Name:
- Buffer solution, pH 7.00 (^+0.01 @ 25^oC), Colored Yellow, Specpure|r, NIST Traceable
- Structure:
- Chemical Name:
- Thymolphthalein
- CAS:
- 125-20-2
- MF:
- C28H30O4
- Chemical Name:
- Acid modified starch
- CAS:
- 68412-29-3
- MF:
- (C6H10O5)n
- Structure:
- Chemical Name:
- 2-Nitroaniline
- CAS:
- 88-74-4
- MF:
- C6H6N2O2
- Structure:
- Chemical Name:
- 2,5-DINITROPHENOL
- CAS:
- 329-71-5
- MF:
- C6H4N2O5
- Structure:
- Chemical Name:
- o-Cresolphthalein
- CAS:
- 596-27-0
- MF:
- C22H18O4
- Structure:
- Chemical Name:
- SULFONAZO 3
- CAS:
- 1738-02-9
- MF:
- C22H16N4O14S4
- Structure:
- Chemical Name:
- METHYLENE BLUE
- CAS:
- 122965-43-9
- MF:
- C16H20ClN3OS
- Structure:
- Chemical Name:
- BIS(2,4-DINITROPHENYL)ACETIC ACID ETHYL ESTER
- CAS:
- 5833-18-1
- MF:
- C16H12N4O10
- Structure:
- Chemical Name:
- LACMOID
- CAS:
- 33869-21-5
- MF:
- C24H16N2O6
- Structure:
- Chemical Name:
- BENZYL ORANGE
- CAS:
- 36402-77-4
- MF:
- C19H16N3NaO3S
- Structure:
- Chemical Name:
- 1,3,5-TRINITROBENZENE
- CAS:
- 99-35-4
- MF:
- C6H3N3O6
- Structure:
- Chemical Name:
- ARSENAZO III
- CAS:
- 1668-00-4
- MF:
- C22H18As2N4O14S2
- Structure:
- Chemical Name:
- PENTAMETHOXY RED
- CAS:
- 1755-51-7
- MF:
- C24H26O6
- Structure:
- Chemical Name:
- CI NO 52015
- CAS:
- 97130-83-1
- MF:
- C32H38Cl4N6OS2Zn