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Preparation of Alcohols from Grignard Reagents

50. The bromi...

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50. The bromination of acetone that occurs in acid solution is represented by this equation CH3COCH3(aq)+Br2(aq)__>CH3COCH2Br(aq)+H(aq)+Br-(aq) These kinetic dara were obtained for a given reaction concentration

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Q. The bromination of acetone that occurs in acid solution is represented by this equation.

C H_{3} C O C H_{3} (a q .) + B r_{2} (a q .) \to

C H_{3} C O C H_{2} B r (a q .) + H^{+} (a q .) + B r^{-} (a q .)

These kinetic data were obtained from given reaction concentrations.
Initial concentrations, (M)

[C H_{3} C O C H_{3}]

[B r_{2}]

[H^{+}]

0.30 0.05 0.05
0.30 0.10 0.05
0.30 0.10 0.10
0.40 0.05 0.20
Corresponding initial rate of disappearance of

B r_{2}, M s^{- 1}

5.7 \times 10^{- 5}

5.7 \times 10^{- 5}

1.2 \times 10^{- 4}

3.1 \times 10^{- 4}

Based on these data, the rate equation is:

2 B r^{-} (a q) + C l_{2} (a q) \to 2 C l^{-} (a q) + B r_{2} (a q)

is used for commercial preparation of bromine from its salts. Suppose we have 50 mL of a 0.06 M solution of NaBr. What volume of a 0.05 M solution of

C l_{2}

is needed to react completely with the

B r^{-} ?

Q. Consider the reaction represented by the equation represented by the equation

C H_{3} C l (g) + H_{2} O (g) \to C H_{3} O H (g) + H C l (g)

These kinetic data were obtained for the given reaction concentrations

Initial conc (M)	Initial conc (M)	Initial rate of disappearance of
$[C H_{3} C l]$	$[H_{2} O]$	$C H_{3} C l (M s^{- 1}$
0.2	0.2	1
0.4	0.2	2
0.4	0.4	8

H_{2} O

is taken in large excess, the order of the reaction will be:

Balance the following redox reactions:

{B r}_{2} (a q) + {O H}^{-} (a q) ⟶ {B r}^{-} (a q) + B r O_{3}^{-} (a q)

Q. The following reaction occurs in a beaker:

{A g}^{+} (a q) + {C l}^{-} (a q) \to A g C l (s)

. If a solution of sodium chloride were added to this beaker,

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