At a certain temperature the dissociation constants of formic acid and acetic acid are $$1.8 \times {10^{ - 4}}$$ and $$1.8 \times {10^{ - 6}}$$ respectively. The concentration of acetic acid solution in which the hydrogen ion has the same concentration as in $$0.001\,M$$ formic acid solution is equal to

Question

At a certain temperature the dissociation constants of formic acid and acetic acid are $$1.8 \times {10^{ - 4}}$$ and $$1.8 \times {10^{ - 6}}$$ respectively. The concentration of acetic acid solution in which the hydrogen ion has the same concentration as in $$0.001\,M$$ formic acid solution is equal to

A. 0.001 $$M$$

B. 0.01 $$\,M$$

C. 0.1 $$\,M$$

D. 0.0001 $$\,M$$

Answer : 0.01 $$\,M$$

Solution :
$$\left[ {{H^ + }} \right] = \sqrt {C \times {K_a}} = \sqrt {0.001 \times 1.8 \times {{10}^{ - 4}}} $$ for formic acid
$$\left[ {{H^ + }} \right] = \sqrt {{C_2} \times 1.8 \times {{10}^{ - 5}}} $$ for acetic acid Equating and solving, $${C_2} = 0.01\,M.$$

Releted MCQ Question on
Physical Chemistry >> Ionic Equilibrium

Releted Question 1

Molten sodium chloride conducts electricitry due to the presence of

A. free electrons

B. free ions

C. free molecules

D. atoms of sodium and chlorine

Releted Question 2

An acidic buffer solution can be prepared by mixing the solutions of

A. ammonium acetate and acetic acid

B. ammonium chloride and ammonioum hydroxide

C. sulphuric acid and sodium sulphate

D. sodium chloride and sodium hydroxide.

Releted Question 3

The $$pH$$ of a 10^-8 molar solution of $$HCl$$ in water is

A. 8

B. -8

C. between 7 and 8

D. between 6 and 7

Releted Question 4

Of the given anions, the strongest Bronsted base is

A. $$CI{O^ - }$$

B. $$CIO_2^ - $$

C. $$CIO_3^ - $$

D. $$CIO_4^ - $$

Practice More Releted MCQ Question on
Ionic Equilibrium

Practice More MCQ Question on Chemistry Section

Physical Chemistry Some Basic Concepts in Chemistry Stoichiometry States of Matter Solid, Liquid and Gas Atomic Structure Chemical Thermodynamics Solutions Solid State Surface Chemistry Chemical Equilibrium Ionic Equilibrium Chemical Kinetics Redox Reaction Electrochemistry Nuclear Chemistry

Inorganic Chemistry Chemical Bonding and Molecular Structure Ores and Metallurgy Classification of Elements and Periodicity in Properties Hydrogen S - Block Elements P - Block Elements D and F Block Elements Co - ordination Compounds Qualitative Analysis Preparation and Properties of Compounds Environmental Chemistry

Organic Chemistry General Organic Chemistry Isomerism Purification and Characterisation of Organic Compounds Hydrocarbons (Alkane, Alkene and Alkyne)Aromatic hydrocarbon Electrophilic Aromatic Substitution (Haloalkanes and Haloarenes)Alkyl and Aryl Halide Reactions on Benzene Alcohol, Phenol and Ether Aldehyde and Ketone Carboxylic Acid Organic Compounds Containing Nitrogen Name Reactions Polymers Biomolecules Chemistry in Everyday Life Practical Organic Chemistry