Chem 111, Quiz Buffer Name For all equilibrium problems, you must write: (1) All

Question

Chem 111, Quiz Buffer Name For all equilibrium problems, you must write: (1) All eguilibrium equations (2) All initial and equilibrium concentrations 32.00 (3) All equilibrium expressions 1) (a) Write the equilibrium equation for the ionization of HCIO2 (aq) (b) How will the [H'] ion concentration of dilute solution of HCIO2 change if we: (Circle the correct one) (i) Add NaCIO (i i) Add water. Answer: Answer: Increase, decrease, or remain the same Increase, decrease, or remain the same 2) (a) Calculate the pH of a solution made by mixing 42.00mL of 0.170 M HCIO2 and 36.00 mL of 0.130 M NaCIO2 (Ka for HCIO2 is 6.3 x 10) Set up: (b) Calculate the pH of a solution made by mixing 40.00 mL of the solution in question (a) above and 18.00mL of water. Set up:

Explanation / Answer

Q1a

HClO2 is a weak acid, will ionize in water to form:

HClO2 + H2O <-> H3O+ ClO2-

b)

if we add NaClO2 --> ClO2- ions increases

so this favours left side formation, i.e. HClO2 instead of H3O+ + ClO2-

therefore, it must decrease, i.e. [H+] decreases

addition of water --> will dilute the system , therefore, this affects.

Q = [H+][ClO2-]/[HClO2]

Q top decreases, so the system must form H+ and ClO2- to counterbalance

H+ increases

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