• benainouna (61)in StemSocial • 3 days ago

  The stability of chemical substances

  Well-developed analytical methods are available to prove the presence of a compound body and specify its composition. However, the compound that a scientist is interested in…

  $4.54

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   215 2
• benainouna (61)in StemSocial • 6 days ago

  Chemistry of water -Part 28-

  3- Calibration of phosphate ions: In wastewater and natural water, phosphorus is among the dissolved organic or mineral compounds. The following are the most important…

  $0.03

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   6 0
• benainouna (61)in StemSocial • 9 days ago

  Chemistry of water -Part 27-

  2 - Calibration of nitrate ions: Nitrates, together with phenolic compounds and sulfuric acid, form nitrite derivatives of phenol that can be extracted with an organic…

  $0.00

   6 0
• benainouna (61)in StemSocial • 10 days ago

  Chemistry of water -Part 26-

  Titration of negative electrolytes in water: 1- Chloride anion titration (Cl-): a) Mohr's method: In the presence of potassium chromate, the chloride ions are titrated in a…

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• benainouna (61)in StemSocial • 11 days ago

  Chemistry of water -Part 25-

  Chromatography is a physico-chemical method that allows the separation of the components of a mixture based on the distribution of those components between two immiscible phases.…

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• benainouna (61)in StemSocial • 2 months ago

  Chemistry of water -Part 24-

  Nitrite titration: 2- The sulfanilamide method: This process is based on the diazotization of sulfanilamide with nitrite that has been dissolved in water, then the resulting…

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   15 1
• benainouna (61)in StemSocial • 2 months ago

  Chemistry of water -Part 23-

  Nitrite titration: Nitrite quickly turns into nitrate by bio-oxidation, so it is calibrated immediately after obtaining the water sample. And in the event that it is not…

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   206 1
• benainouna (61)in StemSocial • 2 months ago

  Chemistry of water -Part 22-

  Calibration of organic nitrogen (Kjeldahl method): After the organic nitrogen mineralization process, this method is used to titrate the organic nitrogen and ammoniacal…

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   300 1
• benainouna (61)in StemSocial • 2 months ago

  Chemistry of water -Part 21-

  Total organic carbon (TOC): The amount of carbon in an organic compound is known as total organic carbon (TOC), and it's usually utilized to give an overall idea of the water's…

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• benainouna (61)in StemSocial • 2 months ago

  Chemistry of water -Part 20-

  Biochemical Oxygen Demand (BOD): The amount of dissolved oxygen (DO) required by aerobic biological organisms to decompose organic material contained in a water sample is known…

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   391 1
• benainouna (61)in StemSocial • 2 months ago

  Chemistry of water -Part 19-

  - Chemical oxygen demand (COD): COD represents one of the indicators of pollution, especially for industrial wastewater, as it is used as a comparison between filtered water…

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   300 3
• benainouna (61)in StemSocial • 2 months ago

  Chemistry of water -Part 18-

  4- Measurement of dissolved oxygen: The first approach relies on the volumetric titration of dissolved oxygen in accordance with its oxidizing characteristics. [Photo…

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   277 3
• benainouna (61)in StemSocial • 2 months ago

  Chemistry of water -Part 17-

  Analysis of natural waters: 3- Alkalinity: "Alkalimetric title" The alkalinity of the water is measured using a standard solution of a mineral acid with a phenolphthalein…

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• benainouna (61)in StemSocial • 2 months ago

  Chemistry of water -Part 16-

  Analysis of natural waters: 1- Acidity measurement: When some of the dissolved CO2 interacts with the molecules of water, carbonic acid (H2CO3) is produced. Water becomes…

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   246 1
• benainouna (61)in StemSocial • 2 months ago

  Chemistry of water -Part 15-

  2- Some analytical methods used in laboratories: The most often used analytical technique in water analysis is molecular absorption spectrophotometry. Its foundation is the…

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   272 1
• benainouna (61)in StemSocial • 2 months ago

  Chemistry of water -Part 14-

  Always in the context of water analysis, we previously discussed how to collect samples, and the conditions for keeping them pending analysis. We will continue and discuss methods of water analysis. Before

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   232 1
• benainouna (61)in StemSocial • 2 months ago

  Chemistry of water -Part 13-

  In the previous article , we talked about collecting water samples before analysis, where we touched on the steps that must be followed before collecting samples, in addition…

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   247 1
• benainouna (61)in StemSocial • 2 months ago

  Chemistry of water -Part 12-

  Water analysis: To reach correct analytical results, and obtain accurate values, we must be very careful during the sampling process because it is a very important and…

  $3.46

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  • - Author $1.75
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   215 1
• benainouna (61)in StemSocial • 2 months ago

  Chemistry of water -Part 11-

  Despite the fact that water covers 72 percent of the Earth's surface, the proportion of potable water does not reach 3.5 percent of the total water reserve. The world has…

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   353 2
• benainouna (61)in StemSocial • 3 months ago

  New hydrogen storage methods that are reliable and secure -Part 3-

  Tank types for storing compressed hydrogen gas: Depending on the purposes and service pressures required, there are now four different types of tanks used to store compressed…

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   522 1