19,000+ solved questions for JEE Advanced, JEE Mains, NEET & IChO — with answers and expert explanations.
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
A mixture of a weak acid (say acetic acid) and its salt with a strong base (say sodium acetate) is a buffer solution. Which other pair of substances from the following may have a similar property ?
Buffer solution can be obtained by mixing aqueous solution of
The acidic buffer solution can be prepared by mixing solutions of
A buffer solution of pH 9 can be prepared by mixing
One litre of a buffer solution containing 0.01 M NH4Cl and 0.1 M NH4OH having pKb of 5 has pH of
A certain buffer solution contains equal concentration of X– and HX. the Ka for HX is 10–8. The pH of the buffer is
Solution of 0.1 N NH4OH and 0.1 N NH4Cl has pH 9.25. The pKb of NH4OH is
Which of the following pairs constitutes a buffer?
Consider the following solutions of equal concentrations. A = NH4Cl B = CH3COONa C = NH4OH D = CH3COOH A buffer solution can be obtained by mixing equal volumes of
The pKa value of NH3 is 5. Calculate the pH of the buffer solution, 1 L of which contains 0.01 M NH4Cl and 0.10 M NH4OH
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
An aqueous solution of aluminium sulphate would show