What is Sodium hydroxide: Definition and 27 Discussions

Sodium hydroxide, also known as lye and caustic soda, is an inorganic compound with the formula NaOH. It is a white solid ionic compound consisting of sodium cations Na+ and hydroxide anions OH−.
Sodium hydroxide is a highly caustic base and alkali that decomposes proteins at ordinary ambient temperatures and may cause severe chemical burns. It is highly soluble in water, and readily absorbs moisture and carbon dioxide from the air. It forms a series of hydrates NaOH·nH2O. The monohydrate NaOH·H2O crystallizes from water solutions between 12.3 and 61.8 °C. The commercially available "sodium hydroxide" is often this monohydrate, and published data may refer to it instead of the anhydrous compound.
As one of the simplest hydroxides, sodium hydroxide is frequently utilized alongside neutral water and acidic hydrochloric acid to demonstrate the pH scale to chemistry students.Sodium hydroxide is used in many industries: in the manufacture of pulp and paper, textiles, drinking water, soaps and detergents, and as a drain cleaner. Worldwide production in 2004 was approximately 60 million tons, while demand was 51 million tons.

View More On Wikipedia.org
  1. BenDover

    Oxygen gas produced by a Solid element + sodium hydroxide solution?

    Hello. I am wondering; which solid at room temperature elements produce oxygen gas when put into a solution of sodium hydroxide? Thanks
  2. BWV

    Sodium Hydroxide + Iron Oxide: Green Tint Explained?

    Was spraying oven cleaner on a somewhat rusted grill and my son, who is taking AP chemistry, asked about the green color that appeared. googled sodium hydroxide + iron oxide and got this FeO + 4NaOH = Na₄FeO₃+ 2H₂O but can't find any info on Na₄FeO₃ - would this have a green tint, and is...
  3. navneet9431

    NaOH vs C2H5OH: Reason for Disassociation

    If we put NaOH in water then it disassociates into ##OH^{-}## ions(hydroxyl ions) but if we put ##C_2H_5OH## in water it does not disassociates into ##OH^{-}## ions. What is the reason that ##NaOH## disassociates into ##OH^{-}## ions(hydroxyl ions) whereas ##C_2H_5OH## does not disassociate...
  4. A

    Solving a pH Change After Adding Sulfuric Acid to Sodium Hydroxide

    Homework Statement A 50.0 mL aqueous solution of sodium hydroxide has a pH of 12.50. If 36.00 ml of 0.0200 mol/L sulfuric acid is added to this sodium hydroxide solution, what will be the new pH of the resulting solution? Assume that the temperature stays constant at 25C, and that the volumes...
  5. J

    Actually new subject: Mesitylene/Trimesic Acid -> Benzene

    I have been trying to come up with a way to get from some small carbon molecules (C2,C3) to benzene, or its singly substituted friends like phenol, aniline, or benzoic acid. I stumbled upon a trimerization of acetone to mesitylene (3 C3H7O --> C6H3(CH3)3 + 3H2O) which can be oxidized (via...
  6. Comeback City

    How do I safely react NaOH with HF to yield H20 and NaF?

    I have been reading about how NaOH (Sodium Hydroxide) reacting with HF (Hydrofluoric Acid) yields the products H20 (Water) and NaF (Sodium Fluoride). If I were to do this, would I need the EXACT same quantity of NaOH as HF to get H20 and NaF?
  7. M

    Chlorine gas, Nitrogen and Sodium Hydroxide

    What combination of these might produce a brown solid? For talking's sake...
  8. M

    Can Sodium Hydroxide Effectively Capture and Release CO2 from the Atmosphere?

    I was thinking how it is possible to obtain carbon dioxide capturing it from the atmosphere and releasing it from the solution. I've read that "air meets a mist of a sodium hydroxide solution...the carbon dioxide is absorbed by reaction to form sodium carbonate...this solution is pumped into an...
  9. elementHTTP

    Sodium hydroxide for etching |lifetime |disposal |

    Hi there :) I have 10g of NaOH whit 1 liter of water for photo etching Solution is one year old, and do i need to make new one (is there a lifespan of solution) ? If yes how to dispose it safely ? (can it be disposed in regular drain ?) thanks for your time :)
  10. G

    Extracting Sodium Hydroxide from Soap

    is it possible to extract sodium hydroxide from liquid soap? i need to test the sodium hydroxide. if it is possible, how would i do it?
  11. G

    Testing amount of sodium hydroxide in soap

    i'm doing a task to find the amount of sodium hydroxide (NaOH) in a liquid soap. i have to use titration in it. how exactly would I do this? thanks
  12. M

    Sodium Hydroxide: Purpose & Substitute

    If you had a solution of the following zinc benzalkonium chloride glycerin hydroxyethylcellulose purified water sodium chloride sodium hydroxide what would be the purpose of the sodium hydroxide and would the solution be fine without it? What would you use for a safer substitute?
  13. S

    What vessels to use with hydrochloric acid, sodium hydroxide, and sulfuric acid?

    Hello. I am in need of some assistance in regards to what types of materials I should (and should not) use to contain the various corrosive substances listed in the title. As for the sodium hydroxide, it will be dissolved in water, almost to the point of saturation. I have never dealt with...
  14. J

    Question - phenol and sodium hydroxide

    Question -- phenol and sodium hydroxide Hallo, I am searching the kinetic rate constant and the reaction enthalpy for reaction between phenol and sodium hydroxide. Does sbdy has those two values or knows where to find them? I tried google science directc etc... Thanks j
  15. T

    Manganese (II) chloride and sodium hydroxide

    I reacted a solution of manganese (II) chloride with sodium hydroxide, however I am unsure of the reaction. Do the hydroxide ions displace the chloride ions or take a hydrogen from the water in the complex? Also after that reaction i added a few drops of hyrdogen peroxide, which caused a...
  16. R

    Titration of Nitrous Acid with Sodium Hydroxide

    A 25.0 ml sample of 0.150 M HNO2 is titrated with a 0.150 M NaOH solution. What is the pH at the equivalence point? The Ka of HNO2 is 4.50x10-4 What I can't get is the fact I don't know how much has already been titrated at the equivalence point. So it's difficult to know the total volume...
  17. J

    Sodium hydroxide and hydrochloric acid

    Homework Statement We break down the rxn of NaOH with HCl into putting solid NaOH pellets in water and determine the delta H value. Next, we mix aqueous NaOH with a HCl (aq) and determine the delta H. Then we mix solid NaOH pellets in HCl(aq) and measure the delta H. Can we say that the...
  18. I

    Molarity of Unknown and sodium hydroxide.

    This is the question: Steps: I solved for the molar mass of 3 choices, but I don't know how to get the molar mass from the problem. I can get # of moles in the solution but what about gram? molar mass= gram/moles... tnx
  19. D

    Organic Sample with Hydrochloric Acid and Sodium Hydroxide

    I am confused with how these reaction occurs. I don't know the polarity of compunds like NaHCO3, Amyl acetate, Benzoic Acid, Phenol, and EthylamineOrganic Sample with 1M HC with 1M NaOH with NaHCO3 Amyl acetate insoluble insoluble X Cyclohexane...
  20. S

    Calculating the concentration of sodium hydroxide using calorimetry

    I need to determine the concentration of 100cm3 of aqueous sodium hydroxide solution (approximately to 2 mol dm-3) using 200cm3 of sulphuric acid by calorimetry (Enthalpy of neutralisation). I am using E=mct. As its an exothermic reaction i will be finding the temperature difference. From...
  21. R

    Is Silver Chloride soluble in Sodium Hydroxide ?

    Is "Silver Chloride" soluble in "Sodium Hydroxide"?? Is "Silver Chloride" soluble in "Sodium Hydroxide"?? :confused:
  22. J

    Solving Calculations Involving Azides and Sodium Hydroxide

    Hello people...could u help me pls...coz i am rly stuck in these thing like calculations...i know all right answers but i am not too sure how to get them...please if somebody of us has a few minutes could u help me with that? Thank you very much. Azides are compounds of nitrogen , used...
  23. F

    Is Sodium Hydroxide Compatible with Plastic Drain Pipes?

    I have some crystallized sodium hydroxide drain cleaner that I want to use on my bathroom sink drain, but I just put in a plastic drain and the trap is plastic as well. The clog is past the trap, somewhere deeper. So will the NaOH be alright with the plastic? Not sure exactly what kind of...
  24. T

    What is the Density of a 20% Sodium Hydroxide Solution?

    Hi all.. I have a question regarding the density of a solution. In my lab manual, it said to use 50 mL of 20% NaOH solution I have problem of understanding whether the 20% is the molar or mass or volume basis.. It doesn't state anything else in there.. what does it usually means? And i think...
  25. C

    Sodium hydroxide neutralized by phosphoric acid

    The book that I have goes into very little detail about how to do these sort of problems. I know that you have to balance the equation at the end, which I can do. I do not know how to find the elements! :cry: (Besides the fact that Sodium Hydroxide is NaOH.) Can anyone help? THNX! :biggrin...
  26. T

    Titrate sulphuirc acid with sodium hydroxide

    Coursework time has hit me at college and no matter how much I hit the books the answer is not hitting me. It might be simple but I can't see it. Of course, the question is needed. I had to titrate sulphuirc acid with sodium hydroxide. Not hard to write coursework on and I am sure that if...
  27. J

    Equation Reactions: Solid Zinc + Sodium Hydroxide

    I'm having trouble with sample AP Equation writing questions such as; solid zinc hydroxide is treated with concentrated sodium hydroxide solution. The sheet my teacher provided does not cover this reaction and many others is there any material out there that tells what will happen in most reactions