HARD
JEE Main
IMPORTANT
Earn 100

The concentration of hydrogen ion in a 0.2 M solution of formic acid is 6.4×10-3 mol per litre. To this solution, sodium formate is added to adjust the concentration of sodium formate to one mole per litre. What will be the pH of this solution? The dissociation constant of formic acid is 2.4×10-4 and the degree of dissociation of sodium formate is 0.75.

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Important Questions on Ionic Equilibrium in Aqueous Solutions

HARD
JEE Main
IMPORTANT
When 0.20 M acetic acid is neutralised with 0.20 M NaOH in 0.50 L of solution, the resulting solution is slightly alkaline. Calculate the pH of the resulting solution. KaCH3COOH=1.8×10-5
HARD
JEE Main
IMPORTANT
The pH  of a 0.1 M solution of NH4Cl is 5.13. Find the dissociation constant of NH4OH. Give answer as = dissociation constant ×105
HARD
JEE Main
IMPORTANT
A buffer solution is prepared by dissolving 0.2 mole of sodium formate and 0.25 mole of formic acid in approximately 200 (±50) mL of water. What will be the concentration of H+and OH-? Ka (HCOOH)=1.8×10-4.
HARD
JEE Main
IMPORTANT

A buffer solution was prepared by dissolving 0.05 mole formic acid and 0.06 mole sodium formate in enough water to make 1 litre of solution. Ka(HCOOH)=1.8×10-4.

Calculate the pH of the solution.

HARD
JEE Main
IMPORTANT

A buffer solution was prepared by dissolving 0.05 mole formic acid and 0.06 mole sodium formate in enough water to make 1 litre of solution.KaHCOOH=1.8×10-4.

If this solution were diluted to 10 times its volume, what would be the pH?

HARD
JEE Main
IMPORTANT
How many gram moles HCl will be required to prepare one litre of a buffer solution (containing NaCN and HCN) of pH 8.5 using 0.01 gram-formula weight of NaCN? Kdissociation  HCN=4.1×10-10.
HARD
JEE Main
IMPORTANT
The pKa of acetyl salicylic acid (aspirin) is 3·5 . The pH of gastric juice in the human stomach is about 2-3 and the pH in the small intestine is about 8. Aspirin will be
HARD
JEE Main
IMPORTANT
Calculate the degree of hydrolysis of an N/10 KCN solution at 25°C. Ka(HCN)=7.2×10-10;  Kw=1×10-14.