1. You dissolve acetic acid (HC 2 H 3 O 2 ) in water and measure the concentrati

Question

1. You dissolve acetic acid (HC2H3O2) in water and measure the concentration of hydrogen ions (H+). The concentration H+ in the solution is found to be 0.069 M. Determine the concentration of acetate ion (C2H3O2-) in this solution. You must have correct significant figures to receive full credit. Do NOT include units in your answer.

2. You prepare a 0.500 M solution of acetic acid (HC2H3O2). You measure the pH of the solution and find it to be 3.29. Calculate the concentration of H+ in the solution. Report your answer to two significant figures. Do NOT use scientific notation in your answer.

Explanation / Answer

1.

dissociation takes place in following way:

HC2H3O2 ====> H+ + C2H3O2-

So, one mole of HC2H3O2 produces equal moles of H+ andC2H3O2- .

So concentration of acetate ion= 0.069 M

2.

pH= -log([H+])

so concentration of H+ = 10^ -pH

= 5.13 x 10^ -4 M

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