19. Consider a buffer solution that contains a mixture of aqueous methyl amine (CH3NH2) and CH3NH3Cl....
19. Consider a buffer solution that contains a mixture of aqueous methyl amine (CH3NH2) and CH3NH3Cl.
a. Write the net ionic equation for the reaction that occurs when a few drops of HCl are added to the solution.
b. Write the net ionic equation for the reaction that occurs when a few drops of NaOH are added to the solution.
Homework Answers
buffer solutions act as resist to pH change while adding H+ or OH-.
a) if we add HCl (H+) base part of the buffer solution reacts with HCl.
CH3NH2 + HCl --------------> CH3NH3+ + Cl-
net ionic equation as follows
CH3NH2(aq) + H+(aq) ------------> CH3NH3+(aq)
b) if we add NaOH acidic part of the buffer reacts with NaOH
CH3NH3Cl + NaOH ------------> NaCl + H2O + CH3NH2
net ionic equation as follows
CH3NH3+(aq) + OH-(aq) ----------> H2O(l) + CH3NH2(aq)
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