Current and Solubility

Question 1

Current multiplied by time equals what?

Answer 1

Charge

Question 2

What are the units of current?

Answer 2

Ampere or Coulombs/second

Question 3

In an electrochemical cell, what do you control to limit the extent of the reaction?

Answer 3

The flow of electrons

Question 4

(current * time)/96485 = what?

Answer 4

Moles of electrons

Question 5

What about a half-reaction tells you the moles of electrons transferred in an electrochemical cell?

Answer 5

The stoichiometric coefficients of the half-reaction

Question 6

What is the solubility product constant (Ksp)?

Answer 6

The equilibrium constant K for when a compound dissolves into ions

Question 7

When is a dissolution at equilibrium?

Answer 7

When it is saturated – added solid doesn’t dissolve

Question 8

What are the units of molar solubility (x) ?

Answer 8

mol/L

Question 9

What are the units of gram solubility (s) ?

Answer 9

g/L

Question 10

Will more PbI2 dissolve in pure water or NaI?

Answer 10

Pure water

Question 11

Does a compound dissolve more in pure water or a solution containing an ion in that compound?

Answer 11

Pure water because adding an ion that is already present shifts the reaction away from forming that ion

Question 12

Is Pb(OH)2 more soluble in pure water or 0.1 M HCl solution?

Answer 12

HCl

Question 13

Does a high Ksp mean something is very soluble or less soluble?

Answer 13

Very soluble