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What is the Henderson-Hasselbalch equation?
Note- See the related link for the complete derivation belowSUMMARY OF ACID-DISSOCIATION CONSTANT (pKa) (from Rhoades and Pflanzer Human Physiology)HA ßà H+ + A-1) Reaction to the right à dissociation reaction2) Reaction to left à association reactionThe rate of the dissociation reaction = [HA] x dissociation rate constant k1 (which is a specific value for this reaction).The rate of the association reaction = [H+] x [A-] x association rate constant k2At equilibrium à rates of association and dissociation are =. Thereforek1 x [HA] = k2 x [H+] x [A-]Hence à [H+] x [A-] /[HA] = k1/k2A NEW CONSTANT à is defined for k1/k2 à we call it Ka (equilibrium constant for the reaction and dissociation constant for the acid)A HIGHER Ka à more completely an acid is dissociated à stronger acid à lower pHA LOWER Ka à not as much dissociation à weak acid à higher pHThe Ka is often small in difficult to manipulate à so we present the number in a logarithmic form à pKa (which is the log10 of the INVERSE of KapKa = log10(1/Ka) = --log10(Ka)LOW pKaà high dissociation constant à STRONG ACIDHIGH pKa à low dissociation constant à WEAK ACIDTHE HENDERSON HASSELBALCH EQUATION[H+] x [A-] /[HA] = Ka à therefore[H+] = Ka x [HA] / [A-]Take log of both sidelog[H+] = logKa + log([HA]/[A-]) à multiple both sides by -1-- log[H+] = --logKa + log([A-]/[HA])And because pH = --log[H+] and pKa = log(1/Ka) = --log(Ka)pH = pKa + log([A-]/[HA])HENCE à WHEN [A-] = [HA] à the pH of solution = it's pKa (because the log1 is 0)Conversely à the pKa is the pH at which there are as many molecules of weak acid as there are conjugate base in solution.For the bicarbonate buffer system à (pK = 6.1)Cheers
Ka for acrylic acid is 0.000056 calculate the pH of 0.10m aqueous solution of acrylic acidCalculate percent dissociation of 0.10m solution of acrylic acid?
Ka = ([H+][A-])/[HA]) Let concentration of dissociated acrylic acid be x. 0.000056 = (x2)/(0.10 - x) Rearrange: 0.0000056 - 0.000056x - x2 = 0 x = 0.002339 Therefore: [H+] = 0.002339 M pH = -log[H+] = 2.63 Percent dissociation: 0.002339/0.10 = 0.02339 = 2.34 %
What is recommendation of burglary?
gaboneg ka
Scope and delimitation of malunggay?
- Malunggay Disinfectant - Malunggay as Regualar Cooking Oil - Malunggay as Cleaning Agent - Malunggay as Ointment - Malunggay as Shampoo - Malunggay as Herbal Tea - Malunggay as Rice Coffee there are many possible investigatory projects.
What types mirror in microscope?
Gago patakla ka ne
What is the dissociation constant or Ka for salicylic acid?
3.9 x 10^-6 The above value could be true. However, it also depends on the concentration of the acid and base at that given experiment. In a general sense, it would have a Ka value of somewhere in the 10^-6 range. P.S. Correct me if I am wrong by any given chance
Which is the following describes the relationship between acid strength and Ka value for weak acids?
The Ka value of a weak acid is inversely related to its acid strength. A higher Ka value indicates a stronger acid, while a lower Ka value indicates a weaker acid. Acid strength is determined by the extent of dissociation of the acid in solution, with stronger acids having higher dissociation constants (Ka values).
Which of the following Ka value represent the weakest acid?
ka= 1.62 x 10^-12
What is the ka value for sulfamic acid?
According to CRC reference data, the pKa of sulfamic acid is 1.05, giving a Ka of 11.2. This is a strong acid.
What is the Ka value for hydrobromic acid?
The Ka value for hydrobromic acid (HBr) is approximately 9.0 x 10^-10.
What K value represents the weakest acid?
The K value, or acid dissociation constant (Ka), indicates the strength of an acid in solution. A smaller Ka value corresponds to a weaker acid, as it signifies a lower degree of dissociation in water. Therefore, the weakest acid would have the smallest Ka value, approaching zero, indicating that it does not ionize significantly in solution.
What is the role of the ka value of H3O in determining the strength of an acid?
The Ka value of H3O helps determine the strength of an acid by indicating how well the acid donates protons in a solution. A higher Ka value means the acid is stronger, as it more readily donates protons, leading to a higher concentration of H3O ions in the solution.
What is the ka value of HNO3?
The Ka value of nitric acid (HNO3) is approximately 25 × 10^6.
How can one determine the concentration of H ions from the given value of the acid dissociation constant (Ka)?
To determine the concentration of H ions from the acid dissociation constant (Ka), you can use the formula H (Ka x acid). This formula helps calculate the concentration of H ions in a solution based on the given Ka value of the acid and the initial concentration of the acid.
How to calculate the Ka of an acid?
To calculate the Ka of an acid, you can use the equation Ka H3OA- / HA, where H3O is the concentration of hydronium ions, A- is the concentration of the conjugate base, and HA is the concentration of the acid. The Ka value represents the acid's strength in donating protons in a solution.
How do Ka values of weak acid and a strong acid compare?
The Ka value of a weak acid is smaller than the Ka value of a strong acid because weak acids only partially dissociate in solution, resulting in lower concentrations of H+ ions. Strong acids like hydrochloric acid (HCl) completely dissociate in solution, leading to higher concentrations of H+ ions and therefore a larger Ka value.
Which of the following Ka values represent the weakest acid?
The Ka value closest to 1 x 10^-7 represents the weakest acid, as this value corresponds to a neutral solution and indicates a weaker dissociation of the acid.
