Calculate the pH after 0.034 mole of NaOH is added to 1.00 L of each of the following solutions. a. 0.120 M HONH, (K = 1.1 × 10-8) pH = b. 0.120 M HONH3 Cl pH = c. pure H₂O pH = d. a mixture containing 0.120 M HONH2 and 0.120 M HONH3 Cl pH =

5. Formic acid is an organic acid, found in the venom of ants and bees. The diagram shows a molecule of formic acid dissociating in water. || H H H H H H a) Determine the dissociation constant of a 0.100 mol L-' formic acid solution that has a pH of 2.38. b) Use the dissociation constant calculated in part (a) to identify the strength of this acid.

6. Consider a solution that has 0.00500 M HCl and 0.100 M HF. Ka of HF = 7.2x10-4. a. What is the pH of this solution? b. Suppose the solution was like that in A but also had 0.1 M HOI. (i.e. total solution was a mix of 0.00500 M HCl, 0.100 M HF, and 0.1 M HOI). Ka of HOI = 2.0x10-¹¹. Does this solution have an appreciably different pH than the solution in part a? Support your answer with relevant calculations. HINT: Work from strongest acid to the weakest acid.

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