Question

Part A

A simple way to estimate whether a molecule is a strong electrolyte, a weak electrolyte, or a nonelectrolyte is to examine an equation that accurately describes its behavior in water. When examining the chemical equations, start by looking at the direction and type of reaction arrow. A chemical equation reported in the literature may include a forward reaction arrow (?), equilibrium reaction arrow (?), or reverse reaction arrow (?). Next, determine whether ions are likely to be present and, if present, in what quantities they should be present.

Predict whether each of the compounds depicted as reactants in the following equations would behave as a strong electrolyte, weak electrolyte, or nonelectrolyte. Assume you have no access to any other information and classify them only according to what the equation indicates.

Drag the appropriate chemical equations to their respective bins.

2H2O2(aq) ? 2H2O(l) + O2(g) CH3NH2(aq) + H2O(l) ? CH3NH3+(aq) + OH?(aq) LiOH(s) ? Li+(aq) + OH?(aq) KCl(s) ? K+(aq) + Cl?(aq) C12H22O11(aq)+H2O(l)?2C6H12O6(aq) HI(aq) ? H+(aq) + I?(aq) HF(aq) ? H+(aq) + F?(aq) Ca3(PO4)2(s) ? 3Ca2+(aq) + 2PO43?(aq) Nonelectrolyte Weak electrolyte Strong electrolyte

Part B

This question will be shown after you complete previous question(s).

Part C

Examining the equations or equilibrium constants related to a base, salt, or an acid is an indirect way to determine strength of an electrolyte. The strength of an electrolyte can be examined directly by placing a solution into a circuit so that the voltage or amount of current can be measured. Although conductivity refers to the flow of charged species, we usually examine conductivity with respect to resistance. As the name implies, a solution that does not conduct electricity very well also has a very high resistance.

If solutions containing various acids, bases, and salts were prepared and connected to a circuit that powers a light bulb, the strength of the electrolyte could be estimated by examining the intensity of the light bulb. Complete the following sentences regarding the experimental determination of the electrolyte strength for various molecules dissolved in solution.

Match the classifications in the left column to the appropriate blanks in the sentences on the right. Make certain each sentence is complete before submitting your answer.

Help Reset weak electrolyte nonelectrolyte strong electrolyte A 20 mL solution containing 2 mmol of O3(aq) was integrated into to a circuit that powers a light bulb. When the power supply was turned on, the light bulb remained off. O3(aq) is a . A 20 mL solution containing 2 mmol of NH3(g) was integrated into to a circuit that powers a light bulb. When the power supply was turned on, the light bulb faintly flickered. NH3(g) is a . A 20 mL solution containing 2 mmol of HNO2(aq) was integrated into to a circuit that powers a light bulb. When the power supply was turned on, the light bulb produced a dim glow.HNO2(aq) is a . A 20 mL solution containing 2 mmol of NaCl(s) was integrated into to a circuit that powers a light bulb. When the power supply was turned on, the light bulb produced a bright glow. NaCl(s) is a .

Answer 1

Part 1)

A strong electrolyte will completely dissociate into the constituent ions

Strong electrolyte

LiOH(s) Li⁺(aq) + OH^-(aq)

KCl(s) K⁺(aq) + Cl^-(aq)

HI(aq) H⁺(aq) + I^-(aq)

A weak electrolyte will not completely dissociate into the constituent ions, it may establish an equilibrium

Weak electrolyte

CH₃NH₂(aq) + H₂O(l) CH₃NH₃⁺(aq) + OH^-(aq)

HF(aq) H⁺(aq) + F^-(aq)

Ca₃(PO₄)₂(s) 3Ca²⁺(aq) + 2PO₄^3-(aq)

A weak electrolyte will not dissociate into ions, it may undergo a chemical reaction

Nonelectrolyte

2H₂O₂(aq) 2H₂O(l) + O₂(g)

C₁₂H₂₂O₁₁(aq)+H₂O(l) 2C₆H₁₂O₆(aq)

Part 2)

A strong electrolyte will conduct electricity. A weak electrolyte will conduct electricity to a lesser extent. A non-electrolyte will not conduct electricity due to the absence of ions

A 20 mL solution containing 2 mmol of O₃(aq) was integrated into to a circuit that powers a light bulb. When the power supply was turned on, the light bulb remained off. O₃(aq) is a non electrolyte

A 20 mL solution containing 2 mmol of NH₃(g) was integrated into to a circuit that powers a light bulb. When the power supply was turned on, the light bulb faintly flickered. NH₃(g) is a weak electrolyte

A 20 mL solution containing 2 mmol of HNO₂(aq) was integrated into to a circuit that powers a light bulb. When the power supply was turned on, the light bulb produced a dim glow.HNO₂(aq) is a weak electrolyte

A 20 mL solution containing 2 mmol of NaCl(s) was integrated into to a circuit that powers a light bulb. When the power supply was turned on, the light bulb produced a bright glow. NaCl(s) is a strong electrolyte