the pH of 0.450 M HC7H5O2. The Ka for HC7H5O2 is 6.5 × 10⁻⁵.
=2,27
nature of the solute
nature of the solvent
number of solute particles in a solution
8. (1 point) What is the formula for sulfuric acid? *
H₃SO₄
H₃SO₃
H₂SO₄
H₂SO₃
9. (1 point) Which of the following is an Arrhenius base? *
CH₃COOH
HSO₄⁻
LiOH
NH₄⁺
10. (1 point) A Lewis base is a substance that can ____. *
accept a pair of electrons
accept a hydrogen ion
donate a hydrogen ion
donate a pair of electrons
11. (1 point) Which compound is amphoteric and can act as both a Brønsted-Lowry acid and a Brønsted-Lowry base? *
ammonia
hydrochloric acid
sodium hydroxide
water
12. (1 point) What are the bases in the following equilibrium reaction? CN⁻ + H₂O ⇄ HCN + OH⁻ *
CN⁻ , H₂O
CN⁻, OH⁻
H₂O, HCN
H₂O, OH⁻
13. (1 point) The products of the self-ionization of water are _______. *
H₃O⁺ and H₂O
OH⁻ and OH⁺
OH⁺ and H⁻
OH⁻ and H⁺
14. (1 point) What type of solution is one with a pH of 10? *
acidic
basic
neutral
The type varies depending on the solution.
15. (1 point) The base dissociation constant is only found for ________. *
Concentrated bases
Dilute bases
Strong bases
Weak Bases
16. (1 point) A 18M solution of an acid that ionizes only slightly in solution would be termed_________. *
concentrated and weak
strong and dilute
dilute and weak
concentrated and strong
Short Answer / Essay Questions
Please answer the following with complete sentences If there is math involved please show all of your work -The work is worth at least 1 point.
17. (3 points) If the solubility of a gas is 5.6 g/L at 505 kPa pressure, what is the solubility of the gas when the pressure is 1010kPa? *
18. (4 points) You have your choice of sucrose, C₁₂H₂₂O₁₁, sodium chloride, NaCl, or calcium chloride, CaCl₂ to use to melt the ice on the driveway. Explain why each choice will melt the ice, but also include which is the best choice and why. *
19. (3 points) Calculate the [H⁺] for the aqueous solution in which [OH⁻] is 1 x10⁻⁹. Is this solution acidic, basic or neutral? Show your work *
20. (3 points) What is an acid dissociation constant? When can it not be calculated and why? *
21. (4 points total) Classify each solution as either an acid or a base using the properties that are stated. What are two ways these solutions are similar? Solution A – has a bitter taste and feels slippery Solution B – has a sour taste and feels sticky.
Answer: Element Nickel (Ni), Group 10, Atomic Number 28, d-block, Mass 58.693
b. nonpolar covalent
c. ionic
d. network solid
Answer:
Options A and C
Explanation:
An electrolyte is a substance that produces an electrically conducting solution when dissolved in a polar solvent, such as water. The dissolved electrolyte separates into cations and anions, which disperse uniformly through the solvent.
Based on the definition above the key factor is the ability of the substance to separate into cations and anions.
Option A - This is correct because Some polar covalent compounds are also strong electrolytes. A typical example is HCl.
Option B - This is incorrect because nonelectrolytes end to contain covalent bonds and are typically nonpolar molecules.
Option C - Electrolytes tend to contain ionic bonds that break when the chemical interacts with water and other polar solvents. So electrolytes are typically ionic compounds. This ption is correct.
Option D - A network solid or covalent network solid is a chemical compound (or element) in which the atoms are bonded by covalent bonds in a continuous network extending throughout the material. Examples of network solids include diamond. This option is also incorrect.