Unit 9: #30-36

Question 1

30. Balance the following equation. Then state what is excess and how much.
    C2 H4 + 3O2 -> CO2 + H2 O

Answer 1

1, 3, 2, 2,
C2 H4 excess by 1 molecule

Question 2

31a. What is the purpose of acids?

Answer 2

Donates protons

Question 3

31b. What is the purpose of bases?

Answer 3

Takes protons

Question 4

32. HNO3 acts as a Bronsted-Lowry acid in water. Write a chemical equation from this information.

Answer 4

HNO3 + H2 O -> NO3 + H3 O

Question 5

33. The pOH is baking soda dissolved in water (5.74) at 25 degrees Celsius. Find the pH, [H+], and [OH-]. Is this acidic or basic?

Answer 5

pOH: 5.74,
pH: 8.26,
[OH]: 1.82x10^-6,
[H+]: 5.00x10^-9

Question 6

34. Using the titration curve, what was the volume of NaOH added at the equivalence point?

Answer 6

8.0mL

Question 7

35. Draw a particle diagram of A, B, and C of the titration curve.

Answer 7

SEE KEY

Question 8

36. What is the unknown concentration of the acid?

Answer 8

1.5M HCl