The typical BOD test of a municipal wastewater is 230 ppm at 20 °C. The amount of organic matter remaining in the sample after five days is equivalent to 180 mgO2/L. Calculate the BOD21 of the sample at 25 °C.

Q: In a titration experiment, 10.0 mL of 0.10 M NaOH solution reacted completely with20.0 mL of a…

A: VNaOH =10.0 mL MNaOH = 0.10 M  VHCl = 20.0 mL

Q: An aqueous solution contains 12 % Na2CO3 by weight. Express the composition in mole ratio and mole%.

A: let total mass of aqueous solution=100 g mass of Na2CO3=12 g moles of Na2CO3=mass of Na2CO3molecular…

Q: A solution made by dissolving 0.243 g of a new compound in 25 g of water has a freezing point of -…

A: Given,  mass of water = 25 g ∆Tf=-0.201oC As we know, ∆Tf=Kf×m   (1) molality of solute,m=moles of…

Q: To generate a test aerosol, a suspension of polystyrene spheres in water is aerosolized as…

A: Aerosol has air content so the time expression has gas constant. The water density, viscosity, and…

Q: . A distilling column is fed with a solution containing 0.45mass fraction of benzene and 0,55 mass…

A: Given  Feed contain 0.45 mass fraction benzene and 0.55 mass fraction toluene

Q: Q2/ A continuous distillation column is used to separate a feed mixture at its boiling point,…

A:

Q: A vegetable after drying to moisture content of 5% dry basis (weight basis) is to be packaged…

A: Given data: Initial moisture content of vegetable = 5 % dy basis Final moisture content of vegetable…

Q: What happens when a small amount of sodium hydroxide is added to a mixture of ammonia and ammonium…

A: The given mixture of ammonia and ammonium chloride is a buffer solution.

Q: 1000 kg of a solution containing 50% by weight of a salt dissolved in it is cooled. 400 kg of…

A:

Q: Silica gel is to be used to separate a mixture of butane and butylene. The feed containing 55%…

A: Given :Feed at the bottom contains-Basis feed= 100 mol (supposed)Butane= 55% = 55 molButylene= 45%…

Q: 3. An evaporator is used to concentrate cane sugar solutions. A feed of 10000 kg/day of a solution…

A:

Q: Alum is used as a coagulant. The best dry alum dose from the jar tests is 10 mg/L. Assume dry alum…

A: Given that, The dose of alum = 10 mg/L Converting into kg/L, the dose is = 10 mg = 10×10-6 kg = 1×…

Q: Design of Absorption Tower A mixture of gas containing 90.5% mole % Hydrogen peroxide (H₂O2) and…

A: It is given that,the fraction of methanol recovered is mole fraction of methanol in the gas mixture…

Q: An evaporator is fed with 17400 kg/h of a solution containing 12.1% NaCl, 19.9% NaOH, and the rest…

A:

Q: 10,000 kg/hr of a brine solution containing 6% salt is to be concentrated in an…

A: Given data: Mass flow rate of feed = 10,000 kg/h Composition of salt in feed = 6 % Maas flow rate of…

Q: TASK 2: Q1 (a) Design of Absorption Tower A mixture of gas containing 80.9 mole % Hydrogen peroxide…

A: It is given that,the fraction of methanol recovered is mole fraction of methanol in the gas mixture…

Q: phosphoric acid is usually obtained as an 85% phosphoric acid solution. if it is 15 M, calculate the…

A: Normality is given as the product of the molarity and basicity of an acidic compound.

Q: 80% RH, specific volume 16.5 Cu-ft of air / lb of dry air. Calculate what is wet bulb temperature,…

A:

Q: What is the purpose of soaking fresh cucumbers in a jar of vinegar (5% acetic acid)?  What does the…

A: Vinegar is made by the process of fermentation and is the combination of water and acetic acid…

Q: Fresh air is mixed with recycled air and is blown over the solid. The fresh air contains 0.01 g…

A:

Q: Exercise 3. Find the distance between the trays of a settling chamber to remove dust from a gas…

A: To calculate the distance between the trays of a settling chamber to remove dust from a gas stream,…

Q: Dissolve 2g of table salt in 8 g of distilled water. Calculate the percentage of solvent and solvent

A:

Q: Q1/ Aluminum is diffused into pure silicon to make a semiconductor material. How long should be the…

A: There are two question.Only first one is answered. Given data: Temperature=1300°C=(1300+273)K=1573K…

Q: 11. Calculate the 20 diffraction angle for the (311) plane in platinum. The incident x-ray beam has…

A: Here is the step-by-step explanationStep 1:  The lattice constant (a) for platinum:The lattice…

Q: 4. Calculate the change in pH that results from adding 25 ml of 0.010F HCI to 500ml buffer solution…

A:

Q: moisture is removed from a food using oven drying m method. the total mass of the final dried…

A: Given: Moisture removed from food using oven drying method.

Q: ethane is chlorinated in a continuous reactor by the reaction: c₂h6+ cl₂ some of the product…

A: Given the reaction for chlorination of ethane-     C2H6+Cl2→C2H5Cl + HCl…

Q: Benzoic acid is very useful in the personal care industry to prevent infection caused by bacteria. A…

A:

Q: Two flasks contain 40% and 70% by volume formaldehyde, respectively. If 200 g out of the first flask…

A: There are 2 flask that contain some amount of formaldehyde. First will find how much must be removed…

Q: 3. During the liquid chromatography experiment we will be separating fluorene from fluorenone using…

A: (a). fluorene will exit the column first because it is a primary compound

Q: Silica gel is to be used to separate a mixture of butane and butylene. The feed containing 55%…

A: The feed is a mixture of butane and butylene with 55% and 45% by mole respectively. Silica gel is…

Q: Calculate the molarity of a solution prepared by dissolving 1,56 g of gaseous HCI in enough water to…

A: Mass of gaseous HCl  = 156 g Volume of solution = 268 mL

Q: 60% NaOH is to be concentrated in a triple effect evaporator to 15% NaOH. If equal amount of water…

A: The tripple effect evaporator system has been shown in figure The feed rate is F=100 kg/hr (Taking…

Q: A new drier was tested by drying a wet material with 52.8% moisture (db). It was found that 561.85…

A:

Q: 2. Given 80% RH, Specific volume 16.5 Cu-ft of air / lb of dry air. Calculate what is the wet bulb…

A: Humidification is the process by which the moisture content of air increases. For humidification…