1. Compare your pKa, Ka and molar mass from your experiment to the expected values for KHP. How well do they compare? What might account for the differences? 2. Based on your results in Part 1, is the method used reliable in determining pKa, Ka and molar mass of a weak acid? Explain. 3. Discuss your thinking on how you determined the identity of your unknown. Were there two (or more) acids that were difficult for you to distinguish between? If so, how did you makeyour final decision?

Acids & Bases: Understanding Connections Between Descriptions if Weak Acid Dissociations For a certain acid pka is 3.58. Calculate the pH at which an aqueous solution of this acid would be 6.5% dissociated. Round your answer to 2 decimal places.    *Photo included below

Calculate the pH of a 0.35 M solution of hydrocyanic acid (HCN), which has a pKa of 9.31. Your answer should have 3 significant figures (i.e. 9.99).

Thank you!

3. Consider Lewis structure for hydrogen fluoride (HF). H- a. If hydrogen fluoride were to behave as an acid (if possible), draw the Lewis structure of its resulting conjugate base. b. Reflecting on your answer for Part A and using the three acid-base models above, would you predict the conjugate base would form? (Does this situtation make sense)? c. If hydrogen fluoride were to behave as a base (if possible), draw the Lewis structure of its resulting conjugate acid. d. Reflecting on your answer for Part A and using the three acid-base models above, would you predict the conjugate acid would form? (Does this situtation make sense)? e. Considering your responses to Parts B and D, would you predict hydrogen fluoride would behave as an acid, a base, either, or neither? Explain your reasoning.

1. Consider Lewis structure for methane (CH4). a. If methane were to behave as an acid (if possible), draw the Lewis structure of its resulting conjugate base. b. Reflecting on your answer for Part A and using the three acid-base models above, would you predict the conjugate base would form? (Does this situtation make sense)? c. If methane were to behave as a base (if possible), draw the Lewis structure of its resulting conjugate acid. d. Reflecting on your answer for Part A and using the three acid-base models above, would you predict the conjugate acid would form? (Does this situtation make sense)?

A weak acid, HA, has a pka = 6.78. If one dissolved 0.898 moles of a salt containing one mole equivalent of the conjugate base of the weak acid (e.g. NaA where A is the conjugate base of the weak acid) into 1 Liter of water, then what would be the resulting pH?

why are Ka values difficult to evaluate for acids like HBr, HCl, and HNO3?

How do you solve #10?

Oceans are the largest reservoir of carbon on the planet. Since 1751, average surface pH of the ocean has declined by 0.11 pH (some regions have seen local decline approaching a full unit pH). Consider the equilibrium CO2 dissolution reaction and the diagram above. How would you expect increased ocean acidity to impact the oceans’ capacity to dissolve CO2? Explain your answer.