[ IN-16 ] o -CRESOLPHTHALEIN CAS-No.596-27-0 |
Chemical Formula |
C22H18O4 |
Molecular Weight |
346.38 |
Transition Range |
pH8.2 – pH9.8 colourless to red |
Solution clarity ( Ethanol ) |
Pass |
| [ IN-17 ] ERIOCHROME BLUE BLACK R CAS-No. 2538-85-4 |
Chemical Formula |
C20H13N2NaO5S |
Molecular Weight |
416.39 |
Content |
≥ 70.0% |
Suitability as indicator (For metal titration) |
Pass test |
Solution Clarity (Ethanol) |
Conforms |
Sulfated ash |
15~19% |
[ IN-18 ] FLUORESCEIN CAS-No. 2321-07-5 |
Chemical Formula |
C20H12O5 |
Molecular Weight |
332.31 |
Content( C20 H12O5 )( Spectrophotometric ) |
≥ 90% |
Sensitivity |
Conforms |
Substances insoluble in ethanol |
Conforms |
Sulfated ash |
≤ 0.2% |
[ IN-19 ] LITMUS- I ndicator CAS-No.1393-92-6 |
Transition Range |
pH5.0 – pH8.0 red to blue |
Sensitivity to acid and alkali |
Conforms |
| [ IN-20 ] METHYL RED CAS-No. 493-52-7 |
Chemical Formula |
C15H15N3O2 |
Molecular Weight |
269.31 |
Maximum absorbtion wave length,nm:
λ1 (pH4.5)
λ2 (pH6.2)
|
523–528
427–437
|
Absorption rate of quality, L/cm.g:
λ1 ( α1 pH4.5 ,dry basis)
λ2 (α2 pH6.2 ,dry basis)
|
≥ 130
≥ 70
|
Transition Range |
PH4.5–pH6.2 Red-violet to brownish-Yellow |
Solution Clarity (Ethanol) |
Pass |
Sulfated ash |
≤ 0.2% |
Loss on drying |
≤ 1% |
[ IN-21 ] METHYL RED SODIUM SALT CAS-No.845-10-3 |
| Chemical Formula |
C15H14N3NaO2 |
Molecular Weight |
291.29 |
transition range… |
pH4.5-pH6.2 red violet to brownish yellow |
Appearance of solution |
Conforms |
Sulfated ash |
20.5–24% |
| Loss on drying |
≤ 8% |
