How do you prepare 6N sodium hydroxide?

Answer 1

There are several methods for producing sodium hydroxide, or NaOH.

The most common way of making NaOH at least as long ago as several hundred years if not more than 1000 was by mixing sodium carbonate, lime, and water. Lime is calcium hydroxide, which is made by heating a mixture of water and crushed limestone.

The reaction of sodium carbonate and lime in water is:

Na2(CO3) + Ca(OH)2 -----> CaCO3 + 2 NaOH

The calcium carbonate formed is barely soluble in water, therefore the solution of NaOH is poured, filtered, or pumped away from the calcium carbonate precipitate and the water is allowed to evaporate away.

A solution of NaOH can be easily made by allowing sodium metal to react with water. However, DO NOT PERFORM THIS REACTION WITHOUT A PROFESSOR'S GUIDANCE! The reaction produces hydrogen gas and a lot of heat; enough to ignite the hydrogen and air mixture, which will cause an explosion.

Today, most NaOH is made using DC electricity and seawater. The anode is immersed in, or fed filtered seawater, and it is surrounded by a semipermeable membrane through which chlorine gas cannot pass and enter the solution. At the surface of the anode, chloride ions are oxidized to chlorine gas which is captured. Of course the cathode must be in electrical contact with the anode and the ionic balance must be maintained or nothing will happen. It's impossible to remove chloride anions without either replacing them with another anion or removing an equal number of cations.

When making sodium hydroxide, water is reduced at the cathode to hydrogen gas and hydroxide anions, which replace the lost chloride ions and keep the reaction going. Thus, what is left in the seawater are the sodium and hydroxide ions, plus small concentrations of other ions. Solid NaOH is made by removing the water, probably by vacuum distillation. More pure NaOH can be made by recrystallizing the initial NaOH, or ion-exchange resins may be used to remove ions other than Na+ and OH-. There may be other methods for purifying the initial NaOH.

The reason the chlorine gas must be removed is because a solution of chlorine gas in sodium hydroxide forms chlorine bleach, like Clorox®.

Answer 2

Many over the counter drain cleaners (such as Drano) contain sodium hydroxide. However, if you wish to make oxides or "hydrated" oxides; simply "burn" materials that are likely to contain metal; say Na, containing compounds. Practically "everything" does contain compounds of various metals. Lye or Drano are common products of combustion. That's why the "dirty" ashes of fires can be combined with the drippings of animal fat to make soap to clean your clothes :-).

Answer 3

Since we're dealing with sodium hydroxide (NaOH), it's easy, because with 1 hydroxide ion per formula unit, normality basically equals molarity. So, that means 6 moles NaOH per liter. NaOH is 40grams/mole. 40x6=240, so take 240g of NaOH, dissolve it in a liter of water (careful, it'll get real hot!), and you've got your 6N (or 6M) solution.

Answer 4

40 grams of NaOH in 1000 ml water(1M)

4 grams of NaOH in 100ml water(1M)

0.4 grams of NaOH in 100ml water (0.1M)

0.8grams of NaOH in 100ml water (0.2M)

Answer 5

Bubbling air in the sodium hydroxide water solution.

Answer 6

Add an acid and a few drops of phenolphthalein indicator and when the pink color dissappears the solution is neutral - or at least extremely close.

Answer 7

At the room temperature and in an elemetary laboratory, there is no way to separare sodium from NaOH. The procedure is to fuse the compound at around 1300K and followed by electrolysis.

Answer 8

2.0grams of NaOH in 100ml (.5M)

Answer 9

NaOH