Advertisements
Advertisements
प्रश्न
Calculate the pH of buffer solution composed of 0.01 M weak base BOH and 0.02 M of its salt BA. [Kb = 1.8 × 10–5 for weak base]
Advertisements
उत्तर
pOH = pKb + log10 `(["Salt"])/(["Base"])`
Now, pKb = – log10 Kb
= 5 – log101.8
= 5 – 0.2553
pKb = 4.7447
Then, pOH = 4.7447 + log10 `0.02/0.01`
= 4.7447 + log102
= 4.7447 + 0.3010
pOH = 5.0457
∵ pH + pOH = 14
∴ pH = 14 – pOH
= 14 – 5.0457
= 8.9543 or 8.9
pH = 8.95
The pH of the buffer solution will be 8.95.
APPEARS IN
संबंधित प्रश्न
The ionization constant of benzoic acid is 6.46 × 10–5 and Ksp for silver benzoate is 2.5 × 10–13. How many times is silver benzoate more soluble in a buffer of pH 3.19 compared to its solubility in pure water?
When NH4 Cl and NH4OH are added to a solution containing both, Fe3+ and Ca2+ ions, which ion is precipitated first and why?
Choose the most correct answer:
Which of the Na following is a buffer solution?
Answer the following in one sentence :
Write one property of a buffer solution.
Answer the following in one sentence :
Classify the following buffers into different types :
Sodium benzoate + benzoic acid
Answer the following in one sentence :
Classify the following buffers into different types :
Cu(OH)2 + CuCl2
In biochemical system, pH of blood in our body is maintained due to the following buffer:
The pKb of weak base BOH [Kb(BOH) = 1 × 10-5] will be ______.
Write one application of the following buffer:
Citrate buffer
Write one application of the following buffer:
`"HCO"_3^- + "H"_2"CO"_3`
Write one application of the following buffer:
NH4OH + NH4Cl
Which will make basic buffer?
The dissociation constant of a weak acid is 1 × 10−3. In order to prepare a buffer solution with a pH = 4, the `(["Acid"])/(["Salt"])` ratio should be ____________.
Which of the following will produce a buffer solution when mixed in equal volumes?
On the basis of the equation \[\ce{pH}\] = – log \[\ce{[H+]}\], the \[\ce{pH}\] of 10–8 mol dm–3 solution of \[\ce{HCl}\] should be 8. However, it is observed to be less than 7.0. Explain the reason.
Assertion (A): A solution containing a mixture of acetic acid and sodium acetate maintains a constant value of \[\ce{pH}\] on addition of small amounts of acid or alkali.
Reason (R): A solution containing a mixture of acetic acid and sodium acetate acts as a buffer solution around \[\ce{pH}\] 4.75.
Assertion (A): An aqueous solution of ammonium acetate can act as a buffer.
Reason (R): Acetic acid is a weak acid and \[\ce{NH4OH}\] is a weak base.
Which of the following combinations will constitute a buffer solution?
Write any four applications of buffer solution.
What are buffer solutions?
Explain the types of buffers with example.
Explain buffer action of sodium acetate-acetic acid buffer.
Calculate the pOH of a buffer solution formed from 0.3 M weak base and 0.45 M of its salt with strong acid [pKb = 4.7447].
A buffer solution is prepared by mixing 0.1 M ammonia solution and 0.25 M solution of NH4CI. What is the value of pKb to maintain its pOH at 6?
