why naoh is not primary standard?
479159
Unfortunately, NaOH is not a suitable primary standard. Solid NaOH is highly hygroscopic (it absorbs water from the air) and thus it cannot be accurately weighed. It also absorbs carbon dioxide from the air, forming sodium carbonate and thereby reducing the amount of sodium hydroxide present.
1313909
Hydrochloric acid (HCl) solutions as a secondary standard A HCl solution is used as it can be prepared accurately and is quite stable. Because of this stability it is called a secondary standard. Even more accurate and stable standards are called primary standards.
860510
1. Primary Alcohols. Primary alcohols are those alcohols where the carbon atom of the hydroxyl group(OH) is attached to only one single alkyl group. Some of the examples of these primary alcohols include Methanol (, propanol, ethanol, etc.
1030115
Sodium hydroxide (NaOH) is not a suitable base for this purpose, but sodium amide (NaNH2) can be used. ... In contrast, the three bases on the bottom left of the chart all have the negative charge on an oxygen atom, which is not strong enough to deprotonate a terminal alkyne.
909854
A reagent takes part in a chemical reaction, and is converted to something else. A solvent acts as a support for the reaction to take place in the liquid phase, but the amount should not change. ... For example NaOH is a solid, but is often used as a solution in water, and the solution may be called a reagent.
851224
KOH (aq), or potassium hydroxide, is a strong base. When added to water, it dissociates completelto give mobile ions, including the hydroxide ion which is responsible of the alkaline properties of the substance.
722705
Because in general all acids with the carboxylic group (COOH) are weak or at least not really strong. Just look at formic acid (HCOOH) with a pKa of 3,77 or acetic acid (CH3COOH) with a pKa of 4,75.
692307
Alkali metal and alkaline earth metal hydroxides, such as NaOH, KOH, and Ca(OH)2, are considered strong bases. The con- jugate acid of a strong base is neutral. ... Neutralization of a strong acid and a strong base gives a neutral salt.
287917
Arrhenius argued that bases are neutral compounds that either dissociate or ionize in water to give OH- ions and a positive ion. NaOH is an Arrhenius base because it dissociates in water to give the hydroxide (OH-) and sodium (Na+) ions. ... It also explains why acids neutralize bases and vice versa.
947744
2. 2-‐bromopentane is secondary: a) NaOEt is a strong nucleophile and strong base. ... Therefore, we expect SN2 with a possible minor E2 b) NaI is a strong nucleophile and weak base. DMSO is a polar aprotic solvent.
339380
KHP is slightly acidic, and it is often used as a primary standard for acid-base titrations because it is solid and air-stable, making it easy to weigh accurately. ... It is also used as a primary standard for calibrating pH meters because, besides the properties just mentioned, its pH in solution is very stable.
6614
KHP is slightly acidic, and it is often used as a primary standard for acid-base titrations because it is solid and air-stable, making it easy to weigh accurately. ... And then as a weak acid hydrogen phthalate reacts reversibly with water to give hydronium (H3O+) and phthalate ions.
746301
Along with sodium hydroxide (NaOH), this colorless solid is a prototypical strong base. It has many industrial and niche applications, most of which exploit its caustic nature and its reactivity toward acids. An estimated 700,000 to 800,000 tonnes were produced in 2005.
975603
But when it comes to anything analytical where you start to involve calculations, standardization is a must. This is done with NaOH because it's hygroscopic and readily sucks up the moisture in the air. So what is being weighed isn't totally NaOH, but also the moisture that it has absorbed.
1047963
Dilute simply means that the concentration of the solute of interest, in this case NaOH, is low relative to some reference. One could imagine a non-aqueous, dilute solution of NaOH in, say, methanol. An aqueous solution is one where the solvent is water, regardless of the concentration of the dissolved solute(s).
25816
2-‐bromopentane is secondary: a) NaOEt is a strong nucleophile and strong base. The substrate in this case is secondary. Therefore, we expect SN2 with a possible minor E2 b) NaI is a strong nucleophile and weak base. DMSO is a polar aprotic solvent.
538422
Answer: Because NaHCo3 and Na2Co3 are the products when NaOH reacts with H2CO3 . Hair Sodium Hydroxide is a strong base and carbonic acid is is weak acid due to which basic effect is more and hence sodium bicarbonate and sodium carbonate is basic in nature in aqua solution also.