Question

Write the balanced chemical equations for the (1) reaction of each of the following amines with water and (2) neutralization with HBr:

a. ethylmethylamine

b. propylamine

c. N-methylaniline

Short answer

a. $C{H}_{3}N{H}_2+H_{2}O\to C{H}_{3}N{H}_3+O{H}^{-}$

$C{H}_{3}N{H}_2+HBr\to {\left[C{H}_{3}N{H}_3\right]}^{+}+B{r}^{-}$

b. $C{H}_{3}C{H}_{2}C{H}_{2}N{H}_2+H_{2}O\to C{H}_{3}C{H}_{2}C{H}_{2}N{H}_{3+}+O{H}^{-}$

$C{H}_{3}C{H}_{2}C{H}_{2}N{H}_2+HBr\to {\left[C{H}_{3}C{H}_{2}C{H}_{2}N{H}_3\right]}^{+}+B{r}^{-}$

C. N-methylaniline does not reacts with water or HBr

Step-by-step solution

Part (a) Step 1 :  Given Information

We have to write the balanced chemical eq of reaction of methylamine with water and neutralization reaction with HBr.

Part (a) Step 2 : Reactions

$C{H}_{3}N{H}_2+H_{2}O\to C{H}_{3}N{H}_3+O{H}^{-}$

$C{H}_{3}N{H}_2+HBr\to {\left[C{H}_{3}N{H}_3\right]}^{+}+B{r}^{-}$

Part (b) Step 1 ; Given Information

We have to write the balanced chemical eq of reaction of propylamine with water and neutralization reaction with HBr.

Part (b) Step 2 : Reactions

$C{H}_{3}C{H}_{2}C{H}_{2}N{H}_2+HBr\to {\left[C{H}_{3}C{H}_{2}C{H}_{2}N{H}_3\right]}^{+}+B{r}^{-}$$C{H}_{3}C{H}_{2}C{H}_{2}N{H}_2+H_{2}O\to C{H}_{3}C{H}_{2}C{H}_{2}N{H}_{3+}+O{H}^{-}$

Part(c) Step 1 : Given Information

We have to write the balanced chemical eq of reaction of N-methylaniline with water and neutralization reaction with HBr.

Part(c) Step 2 : Reaction

N-methyl aniline is insoluble in water , hence does not react with water . And moreover it does not react with HBr either