Alpha Question Bank for Medical: Chemistry>Chapter 5 - Equilibrium>Exercise 5>Q 43

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Two weak acids $HA$ and $HB$ , with $K_{a_{1}}$ and $K_{a_{2}}$ as their dissociation constants are mixed. Which of the following is incorrect, if $K_{a_{1}} > K_{a_{2}}$ ?

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Important Questions on Equilibrium

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Alpha Question Bank for Medical: Chemistry>Chapter 5 - Equilibrium>Exercise 5>Q 44

The

pH

of the solution obtained by mixing

10 mL

of

10^{- 1} M

HCl

and

10 mL

of

10^{- 1} M

NaOH

is:

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Alpha Question Bank for Medical: Chemistry>Chapter 5 - Equilibrium>Exercise 5>Q 45

V_{1} mL

of

0.1 M {HNO}_{3}

is mixed with

V_{2} mL

of

0.1 M Sr (OH)_{2} .

The final solution:

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Alpha Question Bank for Medical: Chemistry>Chapter 5 - Equilibrium>Exercise 5>Q 46

The dissociation constant of two weak acids are

K_{a_{1}}

and

K_{a_{2}}

, respectively. Their relative strength is:

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Alpha Question Bank for Medical: Chemistry>Chapter 5 - Equilibrium>Exercise 5>Q 47

The expression

{pK}_{h} = {pK}_{w} - {pK}_{a} - {pK}_{b}

is not applicable to:

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Alpha Question Bank for Medical: Chemistry>Chapter 5 - Equilibrium>Exercise 5>Q 48

The salt

NaA

of weak acid

HA

is dissolved to form its

0.01 M

solution. If the degree of hydrolysis is

0.01,

the

K_{a}

of

HA

at

25 ° C

is:

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Alpha Question Bank for Medical: Chemistry>Chapter 5 - Equilibrium>Exercise 5>Q 49

In a titration experiment,

50.0 mL

of

0.1 M HCl

is being titrated, against

0.1 M

NaOH

. The

pH

of the solution on addition of

49.9 mL

of

NaOH

is approximately:

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Alpha Question Bank for Medical: Chemistry>Chapter 5 - Equilibrium>Exercise 5>Q 50

What volume of

2 M

weak base should be added to

10 ml

of

5 M

solution of its salt with strong acid, so that

pOH = {pK}_{b}

?

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Alpha Question Bank for Medical: Chemistry>Chapter 5 - Equilibrium>Exercise 5>Q 51

The

pOH

of a basic buffer, e.g.

{NH}_{4} OH / {NH}_{4} Cl

, is

5

. If the concentration of the salt is tripled whereas that of the base remains same, what is the new value of

pOH

? (Given

\log 3 : \approx 0.48

)