Chemistry Crash Course NEET>Chapter 5 - Equilibrium>Level 3>Q 17

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To prepare one-litre buffer solution $($ containing $NaCN + HCN)$ , $x$ moles of $HCl$ are added to $0.01$ moles of $NaCN$ . If $pH$ of a buffer is $8.5$ , then the value of $x$ is $(pKa HCN = 9.5)$

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Important Questions on Equilibrium

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Chemistry Crash Course NEET>Chapter 5 - Equilibrium>Level 3>Q 18

The

pH

of a buffer solution decreases by

0.02

units when

0.08 g NaOH

is added to

250 mL

of a buffer solution of

{CH}_{3} COOH

and

{CH}_{3} COOK

at

27 ° C

. What is the buffer capacity of the solution?

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Chemistry Crash Course NEET>Chapter 5 - Equilibrium>Level 3>Q 19

The buffer solution is made up of $HA ($ having $K_{a} = 1.8 \times 10^{- 5})$ and $NaA$ of total molarity $0.29 M$ . The $pH$ of the acidic buffer, with the concentration of salt equal to $0.09 M$ , is, $(\log 1.8 = 0.255; \log 45 = 1.653)$

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Chemistry Crash Course NEET>Chapter 5 - Equilibrium>Level 3>Q 22

The addition of which among the following does not appreciably affect the solubility of calcium oxalate?

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Chemistry Crash Course NEET>Chapter 5 - Equilibrium>Level 3>Q 24

Two buffers

A

(pH = 4)

and

B

(pH = 6)

are prepared with

{CH}_{3} COOH

(0.5 M)

and a

{CH}_{3} COONa

solution of unknown concentration. What is the

pH

of the solution obtained by mixing equal volumes of these two buffers? (

K_{a}

of

{CH}_{3} COOH

is

10^{- 5}

.)

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Chemistry Crash Course NEET>Chapter 5 - Equilibrium>Level 3>Q 25

There is a buffer of volume

V mL

containing

0.1 M {CH}_{3} COOH

and

0.1 M {CH}_{3} {COO}^{-}

ions. What would be the value of

V

so that the

pH

does not change more than

0.5

units on addition of

10 mL

of

1 M HCl

? (

\log 3.1 = 0.5

)

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Chemistry Crash Course NEET>Chapter 5 - Equilibrium>Level 3>Q 26

What is the $pH$ of a solution obtained by mixing $110 mL$ of $0.1 N {CH}_{3} COOH$ and $10 mL$ of $0.1 N NaOH$ ?

( ${pK}_{a} = 4.74, \log 3 = 0.477$ )

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Chemistry Crash Course NEET>Chapter 5 - Equilibrium>Level 3>Q 29

What is the ratio of the

pH

of a solution containing

1 mol

of

{CH}_{3} COONa

and

1 mol

of

HCl

per litre to the solution containing

1 mol

of

{CH}_{3} COONa

and

1 mol

of

{CH}_{3} COOH

per litre?

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Chemistry Crash Course NEET>Chapter 5 - Equilibrium>Level 3>Q 36

Which one is not a buffer solution?