Acid-base theory

Broenstedt acid-base reaction

Exercise 3

   

What are the reactions that occur when the following solutions are mixed? Calculate also the $pH$ obtained after the reaction.

a) $500\; mL$ $H Cl$ $0.10\; M$ and $500\; mL$ $NaOH$ $0.050 M$

$ H_3O^+$ $ +$ $ OH^-$ $\rightarrow $ $ H_2O$ $ + $ $H_2O $ $pH$ $ = $ $1.60$

b) $500\; mL$ $H Cl$ $0.10\; M$ and $100\; mL$ $NH_3$ $0.20\; M$

$ H_3O^+$ $ +$ $ NH_3$ $\rightarrow $ $ H_2O$ $ + $ $NH_4^+ $ $pH$ $ = $ $1.30$

c) $500\; mL$ $H Cl$ $0.10\; M$ and $500\; mL$ $NaOH$ $0.10\; M$

$ H_3O^+$ $ +$ $ OH^-$ $\rightarrow $ $ H_2O$ $ + $ $H_2O $ $pH$ $ = $ $7.00$

d) $500\; mL$ $CH_3COOH$ $0.10\; M$ and $500\; mL$ $NaOH$ $0.20 \;M$

$ CH_3COOH$ $ +$ $ OH^-$ $\rightarrow $ $ CH_3COO^-$ $ + $ $H_2O $ $pH$ $ = $ $12.70$

e) $500\; mL$ $H_2S$ $0.10\; M$ and $500\; mL$ $NaOH$ $0.10\; M$

$ H_2S$ $ +$ $ OH^-$ $\rightarrow $ $ HS^-$ $ + $ $H_2O $ $pH$ $ = $ $11$ $(HS^-$ ampholythe!)