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3 years ago

How does a buffer resist change in ph upon addition of a strong acid?

1 answer:

8 0

Any buffer exists in this equilibrium

HA <=> $H^+ + A^-$
In a buffer, there is a large reservoir of both the undissociated acid (HA) and its conjugate base ( $A^-$ )

When a strong acid is added, it reacts with the large reservoir of the conjugate base ( $A^-$ ) forming a salt and water. Since this large reservoir of the conjugate base is used, the ph does not alter drastically, but instead resist the pH change.

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2 years ago

The isomerization of methylisonitrile to acetonitrile is first order in CH3NC. CH3NC(g) → CH3CN(g) The half life of the reaction

sasho [114]

Answer: The rate constant for the given reaction is $4.33\times 10^{-6}s^{-1}$

Explanation:

For the given chemical equation:

$CH_3NC(g)\rightarrow CH_3CN(g)$

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The equation used to calculate rate constant from given half life for first order kinetics:

$t_{1/2}=\frac{0.693}{k}$

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We are given:

$t_{1/2}$ = half life of the reaction = $1.60\times 10^5s$

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$k=\frac{0.693}{1.60\times 10^5s}=4.33\times 10^{-6}s^{-1}$

Hence, the rate constant for the given reaction is $4.33\times 10^{-6}s^{-1}$

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2 years ago

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lutik1710 [3]

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