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The titer volume of the sample gives the volume of Ferrous Ammonium Sulphate required to react with the excess potassium dichromate in the solution. Similarly, the titer volume for the blank (distilled water) gives the volume of Ferrous Ammonium Sulphate required to react with the excess potassium dichromate in the blank. The equation for the titration can be expressed as:
Cr2O72 -- + FeSO4 (NH4)2SO4 = Cr+ + NH4+ + Fe 3+
From above equation it can be seen that one molecule of dichromate corresponds to one molecule of Mohr's salt. Thus, the difference in volume of excess K2Cr2O7 reacting with
Mohr's solution can be calculated from the expression:
= (Original vol. K2Cr2O7 -- vol. of K2Cr2O7 used for oxidation) solution - (Original vol. K2Cr2O7 -- vol. of K2Cr2O7 used for oxidation) blank
= (Vol. of K2Cr2O7 used for oxidation) blank - Vol. of K2Cr2O7 used for oxidation) solution
Hence, the difference in the titer volume for the solution and the blank is used to find out the Chemical Oxygen Demand directly.
Potassium dichromate is used as an oxidizing agent in the chemical oxygen demand (COD) test to convert organic matter in a water sample into carbon dioxide. The principle behind this is that the potassium dichromate oxidizes the organics in the sample, producing a color change that can be measured spectrophotometrically to determine the COD of the sample.
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Why do you add mercuric sulfate in COD test?
Mercuric sulfate is added to complex chloride (and other halogen) ions. These ions interfere in the COD digestion by complexing with the silver to reduce its catalytic effect and by reacting with the dichromate to form elemental halogens thus giving falsely high readings.
1 kg Sugar if dissolved in water what will be the BOD and COD?
BOD (biochemical oxygen demand) for sugar is typically low since it is easily consumed by microorganisms, while COD (chemical oxygen demand) is usually used to estimate the amount of organic pollutants in water. However, the specific BOD and COD values for 1 kg of sugar dissolved in water would depend on factors like temperature, microbial activity, and the presence of other substances in the water.
Which north American landmark is constantly moving backward because of erosion?
The coastline of Cape Cod in Massachusetts is constantly moving backward due to erosion caused by wave action and storm surges. This natural process is gradually reshaping the land and altering the coastline of Cape Cod.
What animals live in a billabong?
Animals that can be found in a billabong include native fish species like the Murray cod, turtles, water birds such as ducks and herons, frogs, and various insects. These animals rely on the billabong for food, shelter, and water.
What are the name of the small peninsula?
Cape Cod, Florida's Delmarva Peninsula, and the Olympic Peninsula in Washington are examples of small peninsulas in the United States.
Why do you add mercuric sulfate in COD test?
Mercuric sulfate is added to complex chloride (and other halogen) ions. These ions interfere in the COD digestion by complexing with the silver to reduce its catalytic effect and by reacting with the dichromate to form elemental halogens thus giving falsely high readings.
What is a group of cod fish?
The collective nouns for cod are a school of cod and a lap of cod.
What order should you play the call of duty games in?
I would suggest cod , cod 2 , cod 3 , cod 5 ,cod black ops , cod mw , cod mw2 thn mw3 when it comes out
Which is better cod 3 or cod 2?
COD 2
Is blue cod related to red cod?
No but ghost cod is
What is a Cod?
A cod is a fish.
Is cod 5 or cod six worse with voilence?
COD 5 dofinetly
Should you avoid grapes if you are on a low potassium diet?
One cup of grapes has about 175 mg of potassium. An adult's RDA of potassium would usually be around 4500-5000 mg potassium, so 175 mg isn't a lot. Nonetheless, if you need to avoid potassium, the answer is yes - grapes should be avoided. Potassium-rich fruits include bananas, prunes, oranges, cantaloupe, avocados, grapes, blackberries and raisins. Tomatoes, artichokes, lima beans, acorn squash, carrots and spinach are examples of vegetables representing significant sources of potassium. Other high-potassium foods include all meats, dairy products, sunflower seeds, almonds, chicken and some fish, including salmon, cod and flounder.
What fish eat cod?
cod
Salmon vs cod?
Cod
What did the magician say the the fisherman?
Pick a cod, any cod.
What cod games have nazi zombies?
cod: world at war & cod: black ops
