Definitions for ph indicator
ph indi·ca·tor

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1. pH indicatornoun

   An acid-base indicator.

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1. PH indicator

   A pH indicator is a halochromic chemical compound added in small amounts to a solution so the pH (acidity or basicity) of the solution can be determined visually or spectroscopically by changes in absorption and/or emission properties. 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. Indicators can also show change in other physical properties; for example, olfactory indicators show change in their odor. The pH value of a neutral solution is 7.0 at 25°C (standard laboratory conditions). Solutions with a pH value below 7.0 are considered acidic and solutions with pH value above 7.0 are basic. Since most naturally occurring organic compounds are weak electrolytes, such as 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 redox titrations (titrations involving one or more redox reactions as the basis of chemical analysis).

FreebaseRate this definition:1.0 / 2 votes

1. pH indicator

   A pH indicator is a halochromic chemical compound that is added in small amounts to a solution so that the pH of the solution can be determined visually. Hence a pH indicator is a chemical detector for hydronium ions or hydrogen ions in the Arrhenius model. Normally, the indicator causes the colour of the solution to change depending on the pH. Indicators can also show change in other physical properties; for example, olfactory indicators show change in their odor. At 25 °C, 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.

How to pronounce ph indicator?

1. Alex

   US English

   David

   US English

   Mark

   US English

   Daniel

   British

   Libby

   British

   Mia

   British

   Karen

   Australian

   Hayley

   Australian

   Natasha

   Australian

   Veena

   Indian

   Priya

   Indian

   Neerja

   Indian

   Zira

   US English

   Oliver

   British

   Wendy

   British

   Fred

   US English

   Tessa

   South African

How to say ph indicator in sign language?

Numerology

1. Chaldean Numerology

   The numerical value of ph indicator in Chaldean Numerology is: 5

2. Pythagorean Numerology

   The numerical value of ph indicator in Pythagorean Numerology is: 9

Examples of ph indicator in a Sentence

1. Zhou Xiaochoan:

   For the central bank, we think basically to keep monetary policy stable because this is not a nationwide serious problem, generally, if the average indicator of the Chinese economy is OK, the way for the central bank to have a specific policy targeted to the real estate market is difficult.

2. Dr Grant:

   I want to measure lake water and that could potentially be a bio-indicator of earthquakes -- these marine animals are very sensitive to chemical changes in the water.

3. Georges Benjamin:

   Presence of disease is an earlier indicator than the hospitalizations and can help us predict workforce needs, staffing needs for hospitals, if you know you've got a community that hasn't had a lot of infection and all of a sudden you're seeing it grow, then you can usually predict that two or three weeks from then, they're going to be seeing more cases in the hospital( and) tragically, death, too. However, with this new BA.2 Omicron variant we are seeing infections but not many severe hospitalizations.

4. Rachel Batterham:

   Our findings show that loss of smell and taste is a highly reliable indicator that someone is likely to have Covid-19, and if we are to reduce the spread of this pandemic, it should now be considered by governments globally as a criterion for self-isolation, testing and contact tracing.

5. Stuart Kaiser:

   The next stage of the recovery requires consumers to leave the home, go on vacation, go to stores, restaurants and malls, the fact they are showing less willingness to do that is a negative indicator.