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What is the mass percent of sodium in washing soda, Na2CO3

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Am using Daewoo - DWF-750S Top loading washing machine. We have the problem of black film built up at the back of the drum. Am using powder to liquid detergent, the problem still persisted, infact the


Frequently, if you use low temperature washes most of the time, a layer of grease (sounds yukky) builds up in all washing machines. The way around this is to find some clothes (boiler suits or overalls would do) which require high-temperature washes to remove grease and run these through at a high temperature wash for a couple of washes, using both detergent and washing soda (Na2CO3, sodium carbonate). The sodium carbonate will dissolve the grease, both on the clothes and the washing machine.

Jan 31, 2015 | Daewoo Washing Machines

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Remove bloodstains before washing


I take a medication to reduce clotting which means a scratch can bleed for a while. If not noticed and washed straight away it is very difficult to remove. Sodium Hydroxide solution aka caustic soda will remove dried blood from white cotton sheets before washing. It is the main constituent of oven cleaner/ drain/plug hole cleaner. Test before use but note it will remove printed patterns so only use on plain fabric and only on cotton/polyester-cotton/nylon/polyester especially not wool or silk. Use rubber gloves and avoid splashing, wash off skin/eyes immediately if affected. It also dissolves rusty stains and others of a "biological" nature.

on Feb 01, 2015 | Washing Machines

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Cleaning your motorcycle tank


USE ELECTROLYSIS. I recently got this bike for free and decided to just fix it myself. One of the major problems was old gelled gas and rust inside the tank. I thought about getting it bead blasted but because of my budget decided to try myself first. I looked online and found out about electrolysis. Finally a use for chemistry class. All you need is a 8-12 volt battery charger, Washing soda (NOT baking soda, It must be sodium carbonate.) water, and a wire hanger ( or something similar). fill the tank to the top with water and 1/3 cups of the Sodium Carbonate. Rig the wire through something non conductive so that it can sit inside the tank without touching the tank (otherwise you'll see some fireworks). Try and bend the wire into some kind of fork shape to get maximum surface area for the rust to grab onto. Once the wire is in place connect the Positive charge to it and the Negative charge to the tank. Leave it for 1-2 days and then take out the wire and clean it, flush the tank with some clean water and start the proccess again. When the tank is clean get some POR15 sealant and make sure your tank is sealed so it won't rust again. For more detailed intsructions just google electrolysis and there is plenty of documentation.

on Mar 18, 2009 | 1980 Suzuki GS 750 L

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Is menudo bad for you?


this soup isn't very high in nutrients, although it does contain 4 to 5 percent of the daily value for iron, vitamin A, potassium and phosphorus in each serving. You need iron for forming red blood cells, vitamin A for healthy vision, potassium for counteracting the blood-pressure raising effect of sodium and phosphorus for forming strong bones. The only vitamin or mineral typically found in large amounts in menudo is sodium, which you want to limit in your diet. Each 1-cup serving of menudo contains 971 milligrams, or 40 percent of the DV for sodium.

Sep 01, 2014 | Miscellaneous

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Brew rite cleaner.powder in a 8 oz plastic container,the ingredients clean iron resevoirs great.Sodium Bicarbonate is that the only elements in the product?Well it cleans coffee pot and glass great.Thanks...


Brew rite cleaner contains sodium carbonate, NOT sodium Bicarbonate. Sodium bicarbonate is just baking soda, but sodium carbonate is a highly caustic chemical.

According to the MSDS, it contains 40-50% sodium carbonate,
3-5% sodium tripolyphosphate and 10-15% sodium perborate tetrahydrate. The other ingredients must be nonhazardous (fillers, abrasives, etc)

As to frequency of use... it can't damage glass. It might do damage to other materials.

Sep 26, 2013 | Coffee Makers & Espresso Machines

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By using regularly it ,i am getting some pimples ,alergy.


I am not sure what type of skin you have, if it is oily, dry, or combination. I have heard that it works the least with combination skin. Have you had any reaction from any other type of face wash?

Here are the ingredients in case you might know of something you react to.

Aqua / water, Palmitic acid, Myristic acid, Lauric acid, Potassium hydroxide, Stearic acid, Peg-7 glyceryl cocoate, Sodium cocoamphoacetate, Disodium laureth sulfosuccinate, Peg-150 Distearate, Glycerin, Ascorbyl glucoside. Alcohol, Dmdm hydantoin, Limonene, Linalool, Benzyl salcylate, Gentiana lutea / gentiana lutea extract, Propylparaben, Disodium edta, Butylparaben, Cetyl hydroxyethycellulose, Citrus limonum / lemon fruit extract, Bht, Parfum / fragrance, Sodium chloride.

Hope this helps!

Sep 19, 2011 | Garnier Light Fairness Face Wash 50 g Pack...

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I have several SM58s and one is about 30 years old. Repeated removal of leads has worn out the grip hole at the bottom of the body so that leads just slip out. I guess what I really need is a shell. Is it...


Possible solution is fixing with rapid glue. If you put sodium bicarbonate on cianofix glue, it create heat and hard joint. Cleaning with brush and repeat more layer of glue with bicarbonate (baking soda), you can create hard seal. Interesting (but not hard) seal with acetic silicone with around 10% of sodium bicarbonate, can speed up process of creation of silicone (because of creating water inside silicone when sodium bicarbonate neutralizes acetate from silicone).

Aug 23, 2011 | Shure SM58 Professional Microphone

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New Cannon towels are soft but totally nonabsorbant.label says 100% cotton 100 %aragon


Wash in cold water, and use fabric softener as well as dryer sheets when drying at low heat on dryer. To hot of water and to hot o drying will cause this.

May 08, 2011 | Washing Machines

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Calculate the amount of 95% pure Na2CO3 required to prepare 5litre of 0.5 solution


This problem can be easily solved by using proportions:
To use the proportions you have to be aware of the meaning of percent (%).
Percent aways refers to how much of something compared to 100 of it.

For example, as in your problem, there are 95 grams of Na2CO3 per 100 mL of solution.

Percent, when applied to solutions, is more commonly a mass per mass ratio times 100; but for this problem, since you did not specify, I am going to assume you meant grams per volume, since the problem is asking for the "amount" of the Na2CO3 solution, which seems to be the solution volume.

That is, the unknown for this problem is the volume of the 95% Na2CO3.

You want to prepare 5 liters (i.e., 5 L) of a 0.5% solution of Na2CO3.
You don't say what the unit is for the 0.5, but I am taking the liberty of assuming you meant 0.5%.

Another way to state what you want to prepare is this:
You want to prepare 5 L of Na2CO3 solution in which there are 0.5 grams of Na2CO3 per 100 mL of solution.

The percent ratio can be used as a conversion factor, which can be written as a ratio:
0.5 g Na2CO3 / 100 mL solution.
It is important to use the units (in boldface) for each numerical value, because they will guide you error-free in this type of problem! Remember, you can write it this way, because % in this problem means how much (in grams) per 100 (in mL).

****

OK, here is how you use this conversion factor: You multiply it by the given quantity, which is 5 L or 5,000 mL. (I converted the L to mL by multiplying it by 1000, since there are 1000 mL in 1 L - it's a good idea to memorize that.)
5000 mL x (0.5 g / 100 mL).
Remember, always multiply the given quantity (not a ratio) by the conversion factor (which is a ratio). You can assure accuracy by being sure that the like-units (mL) cancel out.
The calculated result of this math operation is 25 g (of the solute, Na2CO3).
Note that the unit for this result is g (or grams) of Na2CO3; you should always be sure to attach the complete unit to the numerical value 25. Also note that the calculated result is actually only a one-sigfig quantity; I indicated that by putting the sig fig in boldface and also underlining it.

****

Before you can complete this problem, you need to use one more conversion factor, already mentioned in the one-sentence 2nd paragraph above:
95 g Na2CO3 / 100 mL solution
However, you will have to invert or flip it as follows:
100 mL solution / 95 g Na2CO3
You will use it as above for the first conversion factor; you will multiply it by a different quantity (not a ratio), as follows:
25 g Na2CO3 x (100 mL solution / 95 g Na2CO3)
Do you see why I flipped the ratio now? To allow cancelling out of the like units, "g Na2CO3."

****

So, the answer to this problem is 26.32 mL of the 95% Na2CO3 solution (before proper rounding off).

After rounding off using the rules for handling sig figs,
the correct answer is 30 mL of the 95% solution of Na2CO3.

Additional Notes
Some information about rounding off
Notice that in the above paragraph, and in the two paragraphs before that, I have underlined the only digit that is considered to be a significant digit (sig fig). An important rule to remember regarding sig figs and rounding off in math operations involving muliplication or division is this:
The calculated result may not have more sig figs in it than was in the quantity with the smallest number of sig figs. So there can be only one sig fig in 26.32, because it was calculated using another one-sigfig number, 25. (The 25 was obtained from calculation using another one-sigfig number, 0.5). To learn more about sig figs and how to consider them properly when rounding off, you may consult almost any chemistry textbook, or Google up on the world wide web.

Regarding the question implied by the problem, it is not based on a realistic situation. The reason I say this is because there is no such thing as a 95% aqueous solution of Na2CO3. Only about 25 grams will dissolve in 100 mL of water. (This fact may be confirmed by looking up the solubility of Na2CO3 in water.)

###

Aug 11, 2010 | Scientific Explorer My First Chemistry Kit

1 Answer

How much salt should you use in a refill of a dishwasher in a hard water area


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If your water is Very Extremley hard then you will need to program your Bosch dishwasher using the Code
H:06 to give you maximum protection here is a comparison table for the codes and the Clark and Normal 0 false false false MicrosoftInternetExplorer4 /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Table Normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-parent:""; mso-padding-alt:0cm 5.4pt 0cm 5.4pt; mso-para-margin:0cm; mso-para-margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:10.0pt; font-family:"Times New Roman"; mso-ansi-language:#0400; mso-fareast-language:#0400; mso-bidi-language:#0400;} Deutsche Härte with the standard Bosch codes.
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I suggest that you use Calgon Dishwasher ( Sodium Carbonate formula Na2CO3.) tablets in the dishwasher every week this is a brand-named water softner that is essential to be used in areas of hard water which causes calcification and catastrophic failure. Use both the salt and the Calgon to suit your hardness.

If you live in a soft water area then set code H:01 as the extra is not required and only use Calgon tablets once a week use normal salt or tablet for the other washes.

Hope this helps



Sep 30, 2009 | Bosch 24 in. SGS43C12 Classixx...

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