How To

To make 4.5 M H2SO4 from concentrated sulfuric acid (98% H2SO4), you would need to dilute it with water. Calculate the volume of concentrated sulfuric acid needed based on the final volume desired, then add water to reach the total volume. Always remember to add acid to water slowly and carefully to avoid splashing or overheating.

One common way to test for the presence of oxygen is by using a glowing splint test. If you bring a glowing splint near a sample suspected to contain oxygen, it will ignite in the presence of oxygen. Another method is using a chemical like potassium permanganate, which will change color in the presence of oxygen.

I assume you mean 0,2 M (0,2 mole/dm3). Say we have a volume of 1 dm3, since you didn't specify that in your question.

MHCl=35,5+1,01 g/mole = 36,51 g/mole

nHCl=C/V

nHCl=(0,2 moles/dm3)/1 dm3 = 0,2 moles

mHCl=M/n

mHCl=(36,51 g/mole)/0,2 moles

mHCl=182,55 gram.

The reaction formula: H2 (g)+ Cl2 (g) --> 2 HCl (aq)

Now that you know how that you get 2 moles of HCl by the reaction, then you need to calculate how much H2 and Cl2 you need for the reaction. Remember that the mass we get from this reaction is 2 moles x 182,55 g/moles = 365,10 gram. That means we need to use a lot of gas when we lead it down in the specified volume of water to form a solution of HCl. Then only use half as much volume of this solution to get the desired concentration of 0,2 M HCl.

It is easier if you have the salt HCl (s), then you only take 182,55 gram of the salt and solve it in a volume of destilled water that is not 1 dm3, but a little less, since the solution might change the density, thus exceeding 1 dm3.

Then, when you have dissolved all the solid salt to ions in the solution, you can fill up to the specified volume of 1 dm3.

To increase the thermal efficiency of a Rankine cycle, you can:

1. Increase the temperature of the heat source entering the boiler.
2. Lower the temperature of the heat sink exiting the condenser.
3. Improve the insulation of the system to reduce heat losses.
4. Enhance the performance of the turbine and pump by reducing internal losses.

Chamisa can be propagated from seeds or cuttings taken in late spring or early summer. To propagate from seeds, collect mature seed heads and sow them in well-draining soil in the fall. For cuttings, take 4-6 inch cuttings from new growth and plant them in soil with good drainage. Keep the soil evenly moist until roots develop.

Rabbitbrush can be propagated from seeds or cuttings as well. To propagate from seeds, collect mature seed heads and sow them in well-draining soil in the fall. For cuttings, take 4-6 inch cuttings from new growth and plant them in moist soil. Maintain high humidity around the cuttings until roots form.

I presume you are titrating a standardized solution of (eg) HCl with NaOH to determine the molarity of the alkali. You would normally use an indicator which will change colour at the end point (eg colourless to pink for phenolphthalein). If the solution is very coloured to begin with it can mask the colour change and so make the end point hard to see and lead to a miscalculation of molarity.

To prepare a 1000 ppm chloride solution from sodium chloride, first calculate the mass of sodium chloride needed using the formula: (ppm concentration * volume of solution in liters) / 1000. Then dissolve this calculated mass of sodium chloride in the desired volume of water to make the solution. Finally, ensure the solution is thoroughly mixed before testing the concentration with appropriate methods.

Doping copper to copper connections is not a common practice. It is more common to use techniques like soldering, brazing, or using mechanical connectors for copper to copper connections. Doping typically refers to adding impurities to semiconductor materials to modify their electrical properties.

By an acid-base titration with 0.1 N hydroxide on phenolphtaleine (colorless pH 8 -> 10 purple-blue). At that endpoint-pH level it is a tri-acidic or tri-protolytic weak acid so its Normality:Molarity ratio is 3:1 ( 3.0 N=1.0 M).

To disassemble a tubular refractometer, first remove any screws or clips holding it together. Gently pull apart the housing, being careful not to damage any internal components. Once the housing is removed, you may be able to access the lenses and prism for cleaning or maintenance. Make sure to follow manufacturer guidelines for disassembly to avoid damaging the refractometer.

To write the net ionic equation for NaOH + H2C4H4O6, first write the balanced molecular equation: NaOH + H2C4H4O6 -> NaC4H4O6 + H2O. Then, split the compounds into ions and remove spectator ions: Na+ + OH- + H2C4H4O6 -> Na+ + C4H4O6^2- + H2O. The net ionic equation is OH- + H2C4H4O6 -> C4H4O6^2- + H2O.

To calculate an excellent structural efficiency score, you would typically assess the ratio of the structure's weight to its load-bearing capacity. A higher load-bearing capacity relative to the structure's weight indicates better efficiency. Factors such as material strength, design optimization, and construction techniques play crucial roles in determining the structural efficiency score.

One ton is 2000 pounds, so just divide 12500 by 2000.

To remove whiteout from paper, you can gently scrape the excess off using a dull knife or your fingernail. You can also try using rubbing alcohol or acetone on a cotton swab to dab at the whiteout until it lifts off the paper. Be careful not to damage the paper while attempting to remove the whiteout.

To convert 4.9 knots to miles per hour, you can multiply by 1.15078. Therefore, 4.9 knots is equal to approximately 5.64 miles per hour.

* Sit down and rest/relax for at least 10mins. * Drink plenty of fluids (preferably sugary drinks). * Eat plenty of snacks, EG. Buscuits, crisps, etc. Other points to remember: Don't: Use heavy machinery for 24hrs. Take a bath for 24hrs. Do any heavy excercises for 24hrs. Lift anything heavy until next day. Hope this helped:-)

To glue nylon, you can use a strong adhesive specifically designed for bonding plastics like nylon. Make sure to clean and roughen the surfaces to be glued, apply the adhesive evenly, and then let it cure according to the manufacturer's instructions for a strong bond.

To remove water stains from wax floors, mix equal parts of white vinegar and water in a spray bottle. Spray the solution onto the affected areas and let it sit for a few minutes. Wipe the area clean with a damp cloth, then dry thoroughly with a separate cloth. This should help remove the water stains from the wax floor.

To remove lemon juice stains from marble flooring, mix baking soda with water to create a paste. Apply the paste to the stained area and allow it to sit for about 24 hours. Then, wipe it off with a damp cloth and rinse the area with water. Repeat the process if necessary.

For a complete list, check out our link to the EnergyEarth blog below. Some quick and easy options are switching to LED lightbulbs, eliminative vamp power and reducing water use with a low-flow showerhead.

http://blog.energyearth.com/?s=how+to&op.x=0&op.y=0

Speed is typically calculated by dividing the distance traveled by the time it took to travel that distance. The formula for speed is Speed = Distance/Time. It is usually measured in units such as meters per second (m/s) or kilometers per hour (km/h).

To improve the balance and stability of an object, you can lower its center of gravity by redistributing weight towards the base, increase friction between the object and its surface, and ensure proper alignment and symmetry in its design. Additionally, adding stabilizing mechanisms like rubber feet or ballast can also enhance stability.

A millimetre is a unit of length. A square foot is a unit of area. The two units are therefore incompatible.

Meiosis is the process of cell division that produces gametes (sperm and egg cells) with half the number of chromosomes as the parent cell. Fertilization is the fusion of a sperm cell with an egg cell, leading to the formation of a zygote with a complete set of chromosomes. Therefore, meiosis produces gametes, which unite during fertilization to restore the full chromosome number in the resulting zygote.