pH Indicator Paper,pH test paper,pH paper Suitable for educational and industrial use Economical
| Gentian violet (Methyl violet 10B) | yellow | 0.0–2.0 | blue-violet |
| Leucomalachite green (first transition) | yellow | 0.0–2.0 | green |
| Leucomalachite green (second transition) | green | 11.6–14 | colorless |
| Thymol blue (first transition) | red | 1.2–2.8 | yellow |
| Thymol blue (second transition) | yellow | 8.0–9.6 | blue |
| Methyl yellow | red | 2.9–4.0 | yellow |
| Bromophenol blue | yellow | 3.0–4.6 | purple |
| Congo red | blue-violet | 3.0–5.0 | red |
| Methyl orange | red | 3.1–4.4 | orange |
| Bromocresol green | yellow | 3.8–5.4 | blue |
| Methyl red | red | 4.4–6.2 | yellow |
| Methyl red | red | 4.5–5.2 | green |
| Azolitmin | red | 4.5–8.3 | blue |
| Bromocresol purple | yellow | 5.2–6.8 | purple |
| Bromothymol blue | yellow | 6.0–7.6 | blue |
| Phenol red | yellow | 6.8–8.4 | red |
| Neutral red | red | 6.8–8.0 | yellow |
| Naphtholphthalein | colorless to reddish | 7.3–8.7 | greenish to blue |
| Cresol Red | yellow | 7.2–8.8 | reddish-purple |
| Phenolphthalein | colorless | 8.3–10.0 | fuchsia |
| Thymolphthalein | colorless | 9.3–10.5 | blue |
| Alizarine Yellow R | yellow | 10.2–12.0 | red |
| Litmus | red | 4.5-8.3 | blue |
| 9 | PH Indicator PaperPH | reel indicator pater( wideth1.23m) | 100kg/roll |
| 10 | PH Indicator Paper 1-14 | Universal Indicator Paper | 1000book/case |
| 11 | PH Indicator Paper 1-14 | Universal Indicator Paper | 100 strips/box |
| 12 | PH Indicator Paper 1-14 | Universal Indicator Paper | 1000 rolls/case |
| 13 | PH Indicator Paper 1-14 | Universal Indicator Paper | 100 strips/bottle |
| 14 | PH Indicator Paper 0-14 | Universal Indicator Paper | 1000 rolls/case |
| 15 | PH Indicator Paper 4.0-9.0 | Special Indicator Paper | 100 strips/box |
| 16 | PH Indicator Paper 4.0-10.0 | 4.0-4.5-5.0-5.5...8.5-9.0-9.5-10.0 | 50 strips/bottle |
| 17 | PH Indicator Paper 4.5-9.0 | 4.5-5.0-5.5-6.0-6.5-7.0-7.5-8.0-8.5-9.0 | 100 strips/box |
| 18 | PH Indicator Paper 5.5-9.0 | Special Indicator Paper | 100 strips/box |
| 19 | PH Indicator Paper 5.5-9.0 | Special Indicator Paper | 1000book/case |
| 20 | PH Indicator Paper 5.5-9.0 | Special Indicator Paper | 100 strips/box |
| 21 | PH Indicator Paper 5.5-9.0 | Special Indicator Paper | 1000 rolls/case |
| 22 | PH Indicator Paper 7.5-9.5 | 7.5-7.9-8.2-8.4-8.6-8.8-9.1-9.5 | 100 strips/box |
| 23 | PH Indicator Paper 7.5-9.5 | 7.5-7.9-8.2-8.4-8.6-8.8-9.1-9.5 | 50 strips/bottle |
| 24 | Special Indicator Paper | PH 3.8-5.4 | 80 sheet/box |
| 25 | Special Indicator Paper | PH 5.5-9.0 | 80 sheet/box |
| 26 | Special Indicator Paper | PH 6.4-8.0 | 80 sheet/box |
| 27 | Phenolphthalein paper | 80 sheet/box | |
| 28 | Litmus Neutral Paper | 5.0-8.0 | 80 sheet/box |
| 29 | Litmus Red Paper | 5.0-8.0 | 80 sheet/box |
| 30 | Litmus Blue Paper | 80 sheet/box | |
| 31 | Congo Red paper | 3.0-5.0 | 80 sheet/box |
| 32 | Potassium iodide starch paper | 80 sheet/box | |
| 33 | Saliva and Urine Indicator paper 5.5-8.0 | 5.5-5.8-6.0-6.2-6.4...7.6-7.8-8.8 | 5m/roll |
| 34 | Saliva and Urine Indicator paper 5.5-8.0 | 5.5-5.8-6.0-6.2-6.4...7.6-7.8-8.8 | 100 strips/box |
particularly suitable for educational and industrial use. In schools, they are economical, as the amount of paper per student can be carefully controlled
A pH indicator is a halochromic chemical compound that is added in small amounts to a solution so that the pH (acidity or basicity) of the solution can be determined visually. Hence a pH indicator is a chemical detector for hydronium ions (H3O+) or hydrogen ions (H+) in the Arrhenius model. Normally, the indicator causes the color of the solution to change depending on the pH. At 25° Celsius, considered the standard temperature, the pH value of a neutral solution is 7.0. Solutions with a pH value below 7.0 are considered acidic, whereas solutions with pH value above 7.0 are basic. As most naturally occurring organic compounds are weak protolytes, carboxylic acids and amines, pH indicators find many applications in biology and analytical chemistry. Moreover, pH indicators form one of the three main types of indicator compounds used in chemical analysis. For the quantitative analysis of metal cations, the use of complexometric indicators is preferred, whereas the third compound class, the redox indicators, are used in titrations involving a redox reaction as the basis of the analysis.
pH indicators are frequently employed in titrations in analytic chemistry and biology experiments to determine the extent of a chemical reaction. Because of the subjective determination of color, pH indicators are susceptible to imprecise readings. For applications requiring precise measurement of pH, a pH meter is frequently used.
Tabulated below are several common laboratory pH indicators. Indicators usually exhibit intermediate colors at pH values inside the listed transition range. For example, phenol red exhibits an orange color between pH 6.8 and pH 8.4. The transition range may shift slightly depending on the concentration of the indicator in the solution and on the temperature at which it is used.
ph Test strips 0-14
