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Why oxygen gas is collected over water?
Oxygen gas is collected over water because it is not very soluble in water, so it will not react with or get absorbed by the water. This allows for a pure sample of oxygen gas to be collected.
How do you calculate dissolved oxygen in water?
Dissolved oxygen in water can be calculated using the formula: DO (mg/L) (Volume of titrant x Normality of titrant x 8 x 1000) / Volume of sample (mL). This formula involves titrating a water sample with a reagent to determine the amount of dissolved oxygen present.
Describe oxygen model in isotopes?
The oxygen isotopic composition in a sample is based on the ratios of oxygen-16, oxygen-17, and oxygen-18 isotopes present. These isotopes have different masses and can vary based on factors like temperature and the source of the oxygen. By analyzing these ratios, scientists can infer information about past climates, sources of water, and geological processes.
How could a sample of gas be collected at the anode during-electrolysis of copper sulfate?
A sample of gas collected at the anode during the electrolysis of copper sulfate would likely be oxygen gas (O2) due to the oxidation of water at the anode. This would be because during this process, water is split into oxygen gas and protons, with the oxygen gas being produced at the anode.
How hydrogen detected in the carbon and hydrogen test?
To test for hydrogen in the given substance, a dry sample is needed. Burn it in excess of oxygen. If the vapour turns white copper sulfate into blue colour, it indicates that there is water in present in the vapour. Hence, the organic compound contains hydrogen.
Why oxygen gas is collected over water?
Oxygen gas is collected over water because it is not very soluble in water, so it will not react with or get absorbed by the water. This allows for a pure sample of oxygen gas to be collected.
What are biochemical oxygen demands?
BOD is the oxygen necessary for living organisms in a sample of water for the degradation of organic compounds.
In BOD testing what is residual DO?
Residual dissolved oxygen (DO) is the amount of oxygen remaining in a water sample after a specific time period during biochemical oxygen demand (BOD) testing. It is used to calculate the oxygen depleted by organic matter present in the sample, which helps in assessing the water quality and pollution levels.
How do you calculate dissolved oxygen in water?
Dissolved oxygen in water can be calculated using the formula: DO (mg/L) (Volume of titrant x Normality of titrant x 8 x 1000) / Volume of sample (mL). This formula involves titrating a water sample with a reagent to determine the amount of dissolved oxygen present.
How do you calculate the concentration of oxygen in sample water?
One common method to measure oxygen concentration in water is to use the Winkler method, where oxygen is chemically fixed and titrated with a reducing agent. Another method is using an oxygen probe (or meter) that measures the dissolved oxygen in water. Both methods provide a numerical value representing the concentration of oxygen in the water sample, usually expressed in milligrams per liter (mg/L) or parts per million (ppm).
Which change in a sample of water could indicate that heterotrophic microbes were active?
a decrease in oxygen level
Which change in a sample pond water could indicate that heterotrophic microbes were active?
a decrease in oxygen level
What is the ratio of hydrogen to oxygen in this sample of four water molecules?
2:1 ratio. There would be eight atoms of hydrogen and four atoms of oxygen.
Describe oxygen model in isotopes?
The oxygen isotopic composition in a sample is based on the ratios of oxygen-16, oxygen-17, and oxygen-18 isotopes present. These isotopes have different masses and can vary based on factors like temperature and the source of the oxygen. By analyzing these ratios, scientists can infer information about past climates, sources of water, and geological processes.
What are the steps of the winkler method in order?
Sample collection and preservation: Collect a water sample and preserve it with metal ions to prevent further oxidation of dissolved oxygen. Titration: Add reagents like iodide, manganese sulfate, and sulfuric acid to the water sample to oxidize the dissolved oxygen. Endpoint detection: Add a starch indicator to the sample, which turns blue upon the consumption of dissolved oxygen. Calculation: Calculate the concentration of dissolved oxygen in the water sample based on the volume of titrant used in the titration.
What is mean chemical oxygen demand-?
The mean oxygen demand is the test done to indirectly determine the amount of organic compounds present in a water sample.
How could a sample of gas be collected at the anode during-electrolysis of copper sulfate?
A sample of gas collected at the anode during the electrolysis of copper sulfate would likely be oxygen gas (O2) due to the oxidation of water at the anode. This would be because during this process, water is split into oxygen gas and protons, with the oxygen gas being produced at the anode.
