Alpha Question Bank for Medical: Chemistry>Chapter 5 - Equilibrium>Exercise 1>Q 214

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A buffer solution is prepared by mixing $0.050 moles$ of a weak acid $HA$ and $0.20$ moles of $NaA$ in sufficient amount of water to give $500 mL$ of solution $(K_{a} for HA is 4.5 \times 10^{- 4})$ The $pH$ of this solution is :

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Important Questions on Equilibrium

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Alpha Question Bank for Medical: Chemistry>Chapter 5 - Equilibrium>Exercise 1>Q 215

A buffer solution with

pH 9

is to be prepared by mixing

{NH}_{4} Cl

and

{NH}_{4} OH

. Calculate the number of moles of

{NH}_{4} Cl

that should be added to one litre of

1.0 M {NH}_{4} OH . [K_{b} = 1.8 \times 10^{- 5}]

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Alpha Question Bank for Medical: Chemistry>Chapter 5 - Equilibrium>Exercise 1>Q 216

K_{b}

of aniline is

10^{- 10}

. A solution containing equal moles of aniline and anilinium chloride will be:

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Alpha Question Bank for Medical: Chemistry>Chapter 5 - Equilibrium>Exercise 1>Q 217

The ionization constant of a certain weak acid is

10^{- 4}

. What should be the

[s a l t]

to

[a c i d]

ratio if we have to prepare a buffer with

pH = 5

using this acid and one of the salts?

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Alpha Question Bank for Medical: Chemistry>Chapter 5 - Equilibrium>Exercise 1>Q 218

In a mixture of acetic acid and sodium acetate the ratio of concentration of the salt to the acid is increased ten times. Then, the

pH

of the solution

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Alpha Question Bank for Medical: Chemistry>Chapter 5 - Equilibrium>Exercise 1>Q 219

Which indicator will be suitable for the titration of acetic acid vs

NaOH

?

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Alpha Question Bank for Medical: Chemistry>Chapter 5 - Equilibrium>Exercise 1>Q 220

The

pH

range of methyl red indicator is :

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Alpha Question Bank for Medical: Chemistry>Chapter 5 - Equilibrium>Exercise 1>Q 221

What is the

pH

of the solution at half neutralization in the titration of

0.1 M {CH}_{3} COOH

and

0.1 M KOH

:

(K_{a} = 1.8 \times 10^{- 5})

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Alpha Question Bank for Medical: Chemistry>Chapter 5 - Equilibrium>Exercise 1>Q 222

0.1 {dm}^{3}

of

0.1 M

acetic acid is titrated against

0.1 M NaOH

. When

50 {cm}^{3}

of

0.1 M NaOH

are added, the

pH

of the solution will be

: ({pK}_{a} = 4.74)