For preparation of 1000 mL of 0.1 N potassium dichromate solution (0.1 N N2Cr2O7, atomic mass of K = 39, Cr = 52, 0 = 16), the amount of analytical grade potassium dichromate required is:
To calculate the amount of analytical grade potassium dichromate required to prepare a 0.1 N solution, we need to use the following formula: Amount (in grams) = (Normality × Equivalent weight × Volume) / 1000 The equivalent weight of potassium dichromate (K₂Cr₂O_7) can be calculated by considering its molecular weight and the number of equivalents of potassium dichromate present in the formula. The formula weight of K₂Cr₂O_7 is: (2 × atomic mass of K) + (2 × atomic mass of Cr) + (7 × atomic mass of O) = (2 × 39) + (2 × 52) + (7 × 16) = 294 + 104 + 112 = 510 The equivalent weight is then calculated by dividing the formula weight by the number of equivalents. Since potassium dichromate donates two equivalents of Cr₂O_7^2- per mole, the equivalent weight is: Equivalent weight = Formula weight / Number of equivalents = 510 / 2 = 255 g/equivalent Now we can substitute the values into the formula: Amount (in grams) = (0.1 N × 255 g/equivalent × 1000 mL) / 1000 Simplifying further: Amount (in grams) = 0.1 × 255 = 25.5 grams Therefore, the correct answer is option 3: 4.9 grams.
The ______________ is a unique institution under ICAR to conduct research and training in agricultural management
Beaushening is practiced
The pest which can be managed by minimizing field gleanings is?
Which physical mutagen has shorter wavelengths than X-rays, is more penetrating, and is commonly generated from the radioactive decay of elements like c...
Winter Banana is a variety of
India has emerged as one of the top 3 countries in the world where the area under organic agriculture expanded the maximum in 2020. The country that ho...
NDVI of a crop can be measured by using
Vegetable oils fortified with which of the following vitamins
The average locust swarm spreads over:
______ open its stomata during night and closes during day time