Wednesday, October 23, 2013

Good evening. First, This is a state in which sodium hydroxide is dissolved in water 1L 40g and sod


Random tfe Q & A
If you make a sodium hydroxide solution 500ml of 1N sodium hydroxide solution from 25%, what should I do How? Molecular weight of 40 so, 1 N sodium hydroxide solution, does not it? Can you do this by melting water to 1L of 25% sodium hydroxide solution 40g of sodium hydroxide? That means, if you are 20g 500ml? You do not know at all ... I'm sorry. I heard from an acquaintance, but I heard it since it is sufficient to sodium hydroxide solution of 4%, to be able to do this by melting in tap water or purified water of 500ml to 25% 500ml = 80g 80g 4% but wrong or do they? In addition, if you want to keep it a solution made in such as poly bottle, you will no problem if How long? Do not have any problem if the room temperature storage temperature? Sorry many times .... Is embarrassed, but there is no knowledge at all. Thank you for your teaching.
Good evening. First, This is a state in which sodium hydroxide is dissolved in water 1L 40g and sodium hydroxide tfe solution of 1N (1N). Valence is because one value at 40 the molecular weight of the sodium hydroxide basis of 40g. And then (which is omitted here for the valence), 1N sodium hydroxide solution I will be about 4% at 40 / (1000 +40). This is the reason for the 4% of the person of the acquaintance said. So, in order to make a 4% solution 25% solution, it means that may be diluted 6.25-fold the 25% solution. Take 100ml 25% solution in graduated cylinder, you can 1N solution tfe roughly if to 625ml whole. And I think whether it is all right if you as a person of the No.1 is you say if you want to make just 500ml. In addition, questions bidder, of the "20 ... molecular weight", will become so in the calculation, tfe but it is an error in the chemical. Molecular weight of sodium hydroxide is 40.
> Sodium hydroxide, does not it? Can ... so 40 is the molecular weight? Different. Can not. The of 25% sodium hydroxide solution, meaning 25% of the total mass that is NaOH. Therefore, NaOH long as the required 40g, 25% sodium hydroxide solution (g) 40/0.25 = 160 is required. You can 1N sodium hydroxide solution if to 1 L by diluting it. It follows that 80 g if 500 mL. In addition, the density of the aqueous sodium hydroxide solution are not guaranteed to 1 g / mL. I should think in terms of mass. It is the same as problem considering the concentration of salt water coming out with math in elementary school as a way of thinking. You just place of salt is you think it 's the NaOH. To what extent is hard to say that all right with respect to storage period. tfe It will also depend tfe on the application, and it will depends tfe on the state of preservation. You can not save you if the container can not be sealed. The called poly bottle is ambiguous, but if the experiment is not required to accuracy, at room temperature (probably not much different even if I put it in the refrigerator) Is it about one to two weeks. I think around here, opinion is different depending on the person.
Thank you for your answer immediately. When you make 500ml of 1N sodium hydroxide solution, do you may be considered 20 20g a molecular weight? 25% sodium hydroxide solution (g) is required 20/0.25 = 80, 1 N sodium hydroxide solution is possible if the 500ml by diluting it. It is not at the level of degree that require accuracy but, Could you please also teaches how to create it? Is it all right if diluted with industrial water or tap water or purified water to adjust to 500ml by taking 80g of 25% sodium hydroxide solution to the graduated cylinder tfe using and spring balance? Sorry in question tfe in elementary school level many times. Because it is something no one person is to be able to tell .... Thank you very much I'm sorry.
I do not understand the provisions. What how to make the provisions of the aqueous sodium hydroxide solution? Please tell me the conversion method milligrams (mg) from (ppm) concentration tfe of 8 difference STDEVP and how to make Excel STDEV 7 6 5 N sodium hydroxide solution 5 1N HCl calculation of concentration 4. It is displayed such as 2.43E-19 is converted to mass 9 molecular tfe weight, maths and you'll see that on a 10 excel terms of the molar concentration. What is E? What unit of 12 specific gravity difference 11 N M and (n?) (Molar)? I do not really understand the other .... These three represent the 13 percent, W / V%, W / W%, please tell us about the pH value of the V / V% ... 14 aqueous sodium hydroxide solution. And 18 spectrophotometer, absorbance official name of the driver's license of the preparation process 17 ordinary vehicles of 16 1M nitric acid for 15 g equivalent equivalent equivalent number? What is a P value that comes with 20 correlation coefficient for the molar concentration and 19 provisions?
I do not understand the provisions. tfe What how to make the provisions of the aqueous sodium hydroxide solution? Converted to the amount of substance (m. .. 9 molecular weight mg, 10 excel terms of the molar concentration of (ppm) concentration of 8 difference STDEVP and how to make Excel STDEV 7 6 5 N sodium hydroxide solution 5 1N HCl concentration calculation of 4 These three represent the ... 13 percent, W / V%, such really understand anymore What is it? unit of 12 specific gravity difference tfe ... 11 N M and (n?) (molar) and 2.43E-19 Calculating, ... to a pH value of 14 aqueous sodium hydroxide tfe solution on the number amount equivalent equivalent equivalent ... 15 g one and 18 spectrophotometer, absorbance official name of the driver's license of the preparation process 17 ordinary vehicles of 16 1M nitric acid and? 19 provisions This is what the P value that comes with 20 correlation coefficient for molar concentration ...
Difference tfe between organic and inorganic materials Mnemonic of chemical symbol What is? Following 'The Ship ... sailor Ribe me, "6 to the same salinity as seawater flame ... 5 tap water fairly' s test of four hazardous materials class B 4 Mnemonic of flame reaction .. . the degree of ionization of acetic acid 12 11 consideration of neutralization titration please tell me the difference between atoms (m. .. 10 mg elemental concentration of NH4 9 (ppm) 7 composition formula is 8 NH3 do not know at all Convert to mass-digit number combination of 13 significant digits method tfe of determining to read Nante 's 17 φ method for generating 16 gas difference between the relative error and unit 15 absolute error of the re ... 14 absorbance now I? 18 molecular weight, molar difference tfe between organic and inorganic 19 terms of concentration tfe and agent? 20 chelate tfe What is?
Difference between organic and inorganic materials What is? Ship of "sailor Ribe I calculated 7 6 Mnemonic specific gravity of 5 flame reaction to the same salinity tfe as seawater 4 tap water Mnemonic of (m. .. symbol of element concentration from milligrams (ppm) The NH4 12 chelating agent with? 11 NH3 read Nante me how to calculate 10 φ to μm from flame ... 9 mm fairly 's test of more ... 8 hazardous materials B 4 kind of "? tfe 13 The three represent the 17 percent 14 composition formula how to calculate the% please tell me the difference between atom and 16 element unit of absorbance ... 15 do not know at all from ppm, W / V%, ... 18 Unit: The difference between the plastic bag and ... 20 plastic bag in hot-dip galvanized and electro-galvanized 19 ml and CC and g, such as dl,
Tell me! Watcher


No comments:

Post a Comment