19,000+ solved questions for JEE Advanced, JEE Mains, NEET & IChO — with answers and expert explanations.
The pH of a 0.1 M aqueous solution of a weak acid (HA) is 3. What is its degree of dissociation ?
A is an aqueous acid; B is an aqueous base. They are diluted separately, then
An acid solution of pH = 6 is diluted hundred times. The pH the solution becomes :
What is the pH of a 0.015 M Ba(OH)2 solution ?
At a certain temperature the value of pKw is 13.4 and the measured pH of solution is 7. The solution is
In decimolar solution, CH3COOH is ionised to the extent of 1.3%. If log 1.3 = 0.11, what is the pH of the solution ?
The pH of 0.5 M aqueous solution of HF (Ka = 2 × 10–4) is
K C K /C x xx a H
10–6 M NaOH is diluted by 100 times. The pH of diluted base is
The pKb of CNis 4.7. The pH of solution prepared by mixing 2.5 mol of KCN of 2.5 mol of HCN in water and making the total volume up to 500 mL is
For preparing a buffer solution of pH 6 by mixing sodium acetate and acetic acid, the ratio of the concentration of salt and acid should be (Ka = 10 –5)
The principal buffer present in human blood is
What is the pH of a buffer solution which is 0.250 M in benzoic acid, C6H5COOH, and 0.150 M in sodium benzoate, C6H5COONa, if a K for benzoic acid is 6.5 × 10–5 ?
Calculate the pH of a buffer prepared by mixing 0.10 mol of sodium formate and 0.05 mole of formic acid in 1.0 L of solution. [HCO2H : Ka =1.8 × 10–4]
A certain buffer solution contains equal concentration of Xand HX. The Kb for X is 10–10. The pH of the buffer is
In a mixture of a weak acid and its salt, the ratio of concentration of acid to salt is increased ten-fold. The pH of the solution
The dissociation constant of HCN is 5 × 10 –10. The pH of the solution prepared by mixing 1.5 mole of HCN and 0.15 moles of KCN in water and making up the total volume to 0.5 dm 3 is
How many moles of HCOONa must be added to 1L of 0.1 M HCOOH to prepare a buffer solution with a pH of 3.4 ? (Given : Ka for HCOOH = 2 × 10 –4); (10-0.3 = 0.5)
The pH of blood does not appreciably change by a small addition of acid or a base because blood
A physician wishes to prepare a buffer solution at pH = 3.58 that efficiently resists a change in pH yet contains only small conc. of the buffering agents. Which one of the following weak acid together with its sodium…
HCN is a weak acid (Ka = 6.2 × 10–10). NH4OH is a weak base (Kb = 1.8 × 10–5). A 1M solution of NH4CN would be :
Ka for HF is 3.5 × 10–4. Calculate Kb for the fluoride ion.
Aq. solution of sodium cyanide is
The solution of strong acid and weak base (FeCl3) is
Which one of the following salts gives an acidic solution in water