why khp is used to standardize naoh?
234313
KHP is a good standard because it can be stored as a stable powder that does not absorb water from the air. So, we can measure out a known mass easily using a balance and calculate the number of moles from the mass.
1169484
2-naphthol is weakly acidic with a pKa of 9.5. Unlike the other two compounds in the mixture, naphthalene is neutral.
926
The reason pKa is used is because it describes acid dissociation using small decimal numbers. The same type of information may be obtained from Ka values, but they are typically extremely small numbers given in scientific notation that are hard for most people to understand.
157840
The reaction isn't normally done using hydrogen cyanide itself, because this is an extremely poisonous gas. Instead, the aldehyde or ketone is mixed with a solution of sodium or potassium cyanide in water to which a little sulphuric acid has been added. ... The rate of the reaction falls if the pH is any higher.
1004222
A commonly used primary standard for titration with sodium hydroxide solution is the weak acid potassium hydrogen phthalate or KHP (C8H5O4K). In this reaction as well, one mole of KHP completely reacts with one mole of NaOH. The titration of NaOH with KHP involves adding NaOH from the burette to a known volume of KHP.
851707
So done by dimensional analysis, it looks like this... To make 250 ml of 0.1 M NaOH, you dissolve 1 gram NaOH in enough water to make a final volume of 250 mls.
882823
This is because HCl and NaOH react in a 1:1 ratio. This forces HCl to be the limiting reactant (reagent) since it only has 1.5 mol versus 3.1 mol of NaOH.
546979
The pKa's of benzoic acid and 2-naphthol are 4.17 and 9.5, respectively, while naphthalene is a neutral compound. Since benzoic acid is much more acidic than 2-naphthol, the weak base, sodium bicarbonate, will be able to effectively remove benzoic acid's acidic hydrogen.
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.
792918
Uses of STP Standard reference conditions are important for expressions of fluid flow rate and the volumes of liquids and gases, which are highly dependent on temperature and pressure. STP commonly is used when standard state conditions are applied to calculations.
1285745
As NaOH[Na+ and OH-]is a base it does not not have a defined pKa value but you can calculate it as follows; pka[NaOH]=pkw - pkb[NaOH] 2.5K views.
1274679
Potassium hydroxide, KOH, contains one bond that is covalent (O-H) and one that is ionic (K-O). Hydrogen is tricky because it is at the top of the periodic table as well as the left side. It is just electropositive enough to form ionic bonds in some cases.
342173
Een base is een molecuul dat een proton (H +) op kan nemen. In een basische oplossing is de concentratie OH - groter dan in zuiver water, de oplossing heeft een hoge pH waarde. K b wordt de baseconstante genoemd. Dit is de waarde van de evenwichtsconstante voor een reactie met een base.
373091
High purity. Stability (low reactivity) Low hygroscopicity (to minimize weight changes due to humidity) High equivalent weight (to minimize weighing errors)
661421
It is just the opposite of pH. A high pOH means the solution is acidic while a low pOH means the solution is basic.
1265520
The pOH scale is similar to the pH scale, in that a pOH of 7 is indicative of a neutral solution. A basic solution has a pOH of less than 7, while an acidic solution has a pOH of greater than 7. The pOH is convenient to use when finding the hydroxide ion concentration from a solution with a known pH.
657411
BHA (butylated hydroxyanisole) and BHT (butylated hydroxytoluene) are widely used by the food industry as preservatives, mainly to prevent oils in foods from oxidizing and becoming rancid. Oxidation affects the flavor, color and odor of foods and reduces some nutrients.