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The hardness of a water sample is measured directly by titration with 0.01 M solution of ethylenediamin etetraacetic acid (EDTA) using eriochrome black T (EBT) as an indicator. The EBT reacts and forms complexes with divalent metallic cations present in the water. During titration, the EDTA replaces the EBT in the complex. When the replacement of EBT is complete at the end point of the titration, the colour of the solution changes from
- a)blue to colourless
- b)blue-green to reddish brown
- c)wine red to blue
- d)reddish brown to pinkish yellow
Correct answer is option 'C'. Can you explain this answer?
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The hardness of a water sample is measured directly by titration with...
The hardness of water is defined as the concentration of multivalent metallic cations which destroys the surfaced property of soap (concentration of ions) which reacts with Soap and leads to the formation of a precipitate.
Ca2+, Mg2+ are major constituents.
A1+3, Sr3+, Fe2+ Cu2+ are minor constituents of hardness.
Hardness is classified into two categories: Carbonate hardness and non-carbonate hardness.
Total Hardness (TH) = Carbonate Hardness (CH) + Non-Carbonate Hardness (NCH)
- Hardness in water can be determined by the determination of amounts of calcium and magnesium ions present in water by filtration.
- Amount of Ca2+, Mg2+ is determined by titration with versanate solution EDTA Method.
- In the EDTA method, water is titrated with ethylene diamine tetraacetic acid using Erichrome Black T (EBT) as an indicator.
- EBT forms wine red colour and titration changes the colour to blue.
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The hardness of a water sample is measured directly by titration with...
Explanation:
Introduction:
The hardness of water is a measure of the concentration of dissolved divalent metallic cations, primarily calcium (Ca2+) and magnesium (Mg2+), in the water sample. The hardness of water can cause various problems such as scaling, reduced soap efficiency, and corrosion.
Titration:
In this method, the hardness of a water sample is determined by titration with a standardized solution of ethylenediaminetetraacetic acid (EDTA). EDTA is a chelating agent that forms stable complexes with metal ions, including calcium and magnesium.
Indicator:
Eriochrome black T (EBT) is used as an indicator in this titration. EBT forms a colored complex with divalent metallic cations, which is initially blue-green in color.
Titration Process:
During the titration, the EDTA solution is slowly added to the water sample containing EBT and the divalent metallic cations. As the EDTA reacts with the metallic cations, it replaces the EBT in the complex and forms its own stable complex.
Endpoint:
The endpoint of the titration is reached when all the divalent metallic cations have reacted with the EDTA solution. At this point, the EDTA has completely replaced the EBT in the complex, resulting in a change in color of the solution.
Color Change:
The color change observed at the endpoint of the titration is from wine red to blue. Initially, the EBT forms a blue-green complex with the divalent metallic cations. However, as the EDTA reacts with the metallic cations, the EBT is displaced and the solution turns wine red. Finally, when all the EBT has been replaced by EDTA, the solution turns blue due to the formation of the EDTA-metal complex. This blue color indicates the endpoint of the titration.
Conclusion:
In this titration method for measuring water hardness, the color change from wine red to blue at the endpoint of the titration indicates the completion of the reaction between the divalent metallic cations and the EDTA solution. This color change is a visual indicator that allows for the determination of the hardness of the water sample.
Introduction:
The hardness of water is a measure of the concentration of dissolved divalent metallic cations, primarily calcium (Ca2+) and magnesium (Mg2+), in the water sample. The hardness of water can cause various problems such as scaling, reduced soap efficiency, and corrosion.
Titration:
In this method, the hardness of a water sample is determined by titration with a standardized solution of ethylenediaminetetraacetic acid (EDTA). EDTA is a chelating agent that forms stable complexes with metal ions, including calcium and magnesium.
Indicator:
Eriochrome black T (EBT) is used as an indicator in this titration. EBT forms a colored complex with divalent metallic cations, which is initially blue-green in color.
Titration Process:
During the titration, the EDTA solution is slowly added to the water sample containing EBT and the divalent metallic cations. As the EDTA reacts with the metallic cations, it replaces the EBT in the complex and forms its own stable complex.
Endpoint:
The endpoint of the titration is reached when all the divalent metallic cations have reacted with the EDTA solution. At this point, the EDTA has completely replaced the EBT in the complex, resulting in a change in color of the solution.
Color Change:
The color change observed at the endpoint of the titration is from wine red to blue. Initially, the EBT forms a blue-green complex with the divalent metallic cations. However, as the EDTA reacts with the metallic cations, the EBT is displaced and the solution turns wine red. Finally, when all the EBT has been replaced by EDTA, the solution turns blue due to the formation of the EDTA-metal complex. This blue color indicates the endpoint of the titration.
Conclusion:
In this titration method for measuring water hardness, the color change from wine red to blue at the endpoint of the titration indicates the completion of the reaction between the divalent metallic cations and the EDTA solution. This color change is a visual indicator that allows for the determination of the hardness of the water sample.
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The hardness of a water sample is measured directly by titration with 0.01 M solution of ethylenediamin etetraacetic acid (EDTA) using eriochrome black T (EBT) as an indicator. The EBT reacts and forms complexes with divalent metallic cations present in the water. During titration, the EDTA replaces the EBT in the complex. When the replacement of EBT is complete at the end point of the titration, the colour of the solution changes froma)blue to colourlessb)blue-green to reddish brownc)wine red to blued)reddish brown to pinkish yellowCorrect answer is option 'C'. Can you explain this answer?
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The hardness of a water sample is measured directly by titration with 0.01 M solution of ethylenediamin etetraacetic acid (EDTA) using eriochrome black T (EBT) as an indicator. The EBT reacts and forms complexes with divalent metallic cations present in the water. During titration, the EDTA replaces the EBT in the complex. When the replacement of EBT is complete at the end point of the titration, the colour of the solution changes froma)blue to colourlessb)blue-green to reddish brownc)wine red to blued)reddish brown to pinkish yellowCorrect answer is option 'C'. Can you explain this answer? for Civil Engineering (CE) 2024 is part of Civil Engineering (CE) preparation. The Question and answers have been prepared according to the Civil Engineering (CE) exam syllabus. Information about The hardness of a water sample is measured directly by titration with 0.01 M solution of ethylenediamin etetraacetic acid (EDTA) using eriochrome black T (EBT) as an indicator. The EBT reacts and forms complexes with divalent metallic cations present in the water. During titration, the EDTA replaces the EBT in the complex. When the replacement of EBT is complete at the end point of the titration, the colour of the solution changes froma)blue to colourlessb)blue-green to reddish brownc)wine red to blued)reddish brown to pinkish yellowCorrect answer is option 'C'. Can you explain this answer? covers all topics & solutions for Civil Engineering (CE) 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for The hardness of a water sample is measured directly by titration with 0.01 M solution of ethylenediamin etetraacetic acid (EDTA) using eriochrome black T (EBT) as an indicator. The EBT reacts and forms complexes with divalent metallic cations present in the water. During titration, the EDTA replaces the EBT in the complex. When the replacement of EBT is complete at the end point of the titration, the colour of the solution changes froma)blue to colourlessb)blue-green to reddish brownc)wine red to blued)reddish brown to pinkish yellowCorrect answer is option 'C'. Can you explain this answer?.
The hardness of a water sample is measured directly by titration with 0.01 M solution of ethylenediamin etetraacetic acid (EDTA) using eriochrome black T (EBT) as an indicator. The EBT reacts and forms complexes with divalent metallic cations present in the water. During titration, the EDTA replaces the EBT in the complex. When the replacement of EBT is complete at the end point of the titration, the colour of the solution changes froma)blue to colourlessb)blue-green to reddish brownc)wine red to blued)reddish brown to pinkish yellowCorrect answer is option 'C'. Can you explain this answer? for Civil Engineering (CE) 2024 is part of Civil Engineering (CE) preparation. The Question and answers have been prepared according to the Civil Engineering (CE) exam syllabus. Information about The hardness of a water sample is measured directly by titration with 0.01 M solution of ethylenediamin etetraacetic acid (EDTA) using eriochrome black T (EBT) as an indicator. The EBT reacts and forms complexes with divalent metallic cations present in the water. During titration, the EDTA replaces the EBT in the complex. When the replacement of EBT is complete at the end point of the titration, the colour of the solution changes froma)blue to colourlessb)blue-green to reddish brownc)wine red to blued)reddish brown to pinkish yellowCorrect answer is option 'C'. Can you explain this answer? covers all topics & solutions for Civil Engineering (CE) 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for The hardness of a water sample is measured directly by titration with 0.01 M solution of ethylenediamin etetraacetic acid (EDTA) using eriochrome black T (EBT) as an indicator. The EBT reacts and forms complexes with divalent metallic cations present in the water. During titration, the EDTA replaces the EBT in the complex. When the replacement of EBT is complete at the end point of the titration, the colour of the solution changes froma)blue to colourlessb)blue-green to reddish brownc)wine red to blued)reddish brown to pinkish yellowCorrect answer is option 'C'. Can you explain this answer?.
Solutions for The hardness of a water sample is measured directly by titration with 0.01 M solution of ethylenediamin etetraacetic acid (EDTA) using eriochrome black T (EBT) as an indicator. The EBT reacts and forms complexes with divalent metallic cations present in the water. During titration, the EDTA replaces the EBT in the complex. When the replacement of EBT is complete at the end point of the titration, the colour of the solution changes froma)blue to colourlessb)blue-green to reddish brownc)wine red to blued)reddish brown to pinkish yellowCorrect answer is option 'C'. Can you explain this answer? in English & in Hindi are available as part of our courses for Civil Engineering (CE).
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The hardness of a water sample is measured directly by titration with 0.01 M solution of ethylenediamin etetraacetic acid (EDTA) using eriochrome black T (EBT) as an indicator. The EBT reacts and forms complexes with divalent metallic cations present in the water. During titration, the EDTA replaces the EBT in the complex. When the replacement of EBT is complete at the end point of the titration, the colour of the solution changes froma)blue to colourlessb)blue-green to reddish brownc)wine red to blued)reddish brown to pinkish yellowCorrect answer is option 'C'. Can you explain this answer?, a detailed solution for The hardness of a water sample is measured directly by titration with 0.01 M solution of ethylenediamin etetraacetic acid (EDTA) using eriochrome black T (EBT) as an indicator. The EBT reacts and forms complexes with divalent metallic cations present in the water. During titration, the EDTA replaces the EBT in the complex. When the replacement of EBT is complete at the end point of the titration, the colour of the solution changes froma)blue to colourlessb)blue-green to reddish brownc)wine red to blued)reddish brown to pinkish yellowCorrect answer is option 'C'. Can you explain this answer? has been provided alongside types of The hardness of a water sample is measured directly by titration with 0.01 M solution of ethylenediamin etetraacetic acid (EDTA) using eriochrome black T (EBT) as an indicator. The EBT reacts and forms complexes with divalent metallic cations present in the water. During titration, the EDTA replaces the EBT in the complex. When the replacement of EBT is complete at the end point of the titration, the colour of the solution changes froma)blue to colourlessb)blue-green to reddish brownc)wine red to blued)reddish brown to pinkish yellowCorrect answer is option 'C'. Can you explain this answer? theory, EduRev gives you an
ample number of questions to practice The hardness of a water sample is measured directly by titration with 0.01 M solution of ethylenediamin etetraacetic acid (EDTA) using eriochrome black T (EBT) as an indicator. The EBT reacts and forms complexes with divalent metallic cations present in the water. During titration, the EDTA replaces the EBT in the complex. When the replacement of EBT is complete at the end point of the titration, the colour of the solution changes froma)blue to colourlessb)blue-green to reddish brownc)wine red to blued)reddish brown to pinkish yellowCorrect answer is option 'C'. Can you explain this answer? tests, examples and also practice Civil Engineering (CE) tests.
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