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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.
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 does high oxygen in water mean?
An oxygenated water (with a higher concentration of oxygen).
How to find the concentration of original sample?
sorry this is the first time i used wikianswers but this is my question? i need help please:A forensic chemist tests a water sample for cyanide. To do so, the sample is diluted by pipetting 1 mL into an empty 100 mL volumetric flask, which is then filled to the mark with deionized water. If the measured concentration was found to be 0.637 mg/L, what was the concentration of the original sample. Give your answer in ppm.Enter your answer in the box provided to 3 significant figures.For very large or small numbers, use scientific notation (e.g. 1.23e-4).Do not enter units.
Which environment has the greater concentration of dissolved oxygen salt water or fresh water?
Freshwater typically has a greater concentration of dissolved oxygen compared to saltwater because oxygen dissolves more easily in freshwater due to its lower salinity. Ocean water is less oxygenated because it has a higher concentration of salts, which can make it more challenging for oxygen to dissolve.
What is the percent oxygen concentration if the water temperature is 10 degrees celsius and the oxygen concentration is 12 ppm?
The concentration of oxygen in water is 88,88 %.
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.
What happens to the concentration of oxygen in the water when the sewage is added?
The concentration of oxygen decrease.
What happens to the concentration of oxygen in water when the sewage is added?
The concentration of oxygen decrease.
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.
How is a sample oxygen different from a sample of a water?
A sample of oxygen is a pure gas composed of oxygen molecules (O2), while a sample of water is a liquid composed of hydrogen and oxygen atoms (H2O). These substances have different physical properties and chemical compositions, with oxygen being a gas and water being a liquid at room temperature.
how does temperature affect the concentration of dissolved oxygen?
Temperature has a direct effect on the concentration of dissolved oxygen in water. As the temperature of the water increases, the solubility of oxygen decreases and the concentration of dissolved oxygen will decrease. Conversely, as the temperature of the water decreases, the solubility of oxygen increases and the concentration of dissolved oxygen will increase. Additionally, warmer water is generally less dense than colder water, resulting in less efficient oxygen transfer.
What does high oxygen in water mean?
An oxygenated water (with a higher concentration of oxygen).
How do you test for oxygen concentration in water?
Oxygen concentration in water can be tested using a dissolved oxygen meter or a chemical test kit. The dissolved oxygen meter measures the amount of oxygen dissolved in the water, while a chemical test kit uses reagents to indicate the oxygen level based on a color change. Both methods provide an accurate assessment of oxygen concentration in water.
A 250.0 ml sample of tap water is found to contain 6.000 microgram of arsenic What is the concentration of arsenic in ppb?
To find the concentration of arsenic in ppb, we need to convert micrograms to grams and then calculate the concentration. First, convert 6.000 micrograms to grams by dividing by 1,000,000. This gives you 0.000006 grams of arsenic. Then, calculate the concentration by dividing the mass of arsenic by the volume of water (in liters) and multiplying by 1 billion to convert to ppb. The concentration of arsenic in the tap water sample is 24 ppb.
What osmosis involves . both water and oxygen water but not oxygen oxygen but not water neither water nor oxygen?
Osmosis involves the movement of water across a semi-permeable membrane from an area of higher water concentration to an area of lower water concentration. It does not involve the movement of oxygen.
