8.1-8.3 Quiz Flashcards
How do you find pH?
-log [H+]
How do you find pOH?
-log[OH-]
How do you find Kw?
[H+][OH-]
What does Kw equal at 25 degrees C?
1.0 x 10^-14
What does Kw rely on?
Temperature so if the temp is not 25 degrees Celsuius things will deviate from the normal
What is the pH and pOH of pure water?
They are both 7 becasue water is a neutral solution.
How do you find pKw? and what does it equal at 25 degrees Celsius?
pH + pOH
14
Acid
Donates hydrogen ions to a solution
Base
Can accept a hydrogen ion
What numbers are acidic?
Any pH less than 7 or any pOH greater than 7
What numbers are basic?
Any pH greater than 7or any pOH less than 7
What is the significant figure rule for pH?
only the digits after the decimal point are significant
What is the set up for every dissociation equation?
Acid(HA) (aq) + water(l) equilibrium arrows A-(aq) + H3O+(aq)
If you are given pH or pOH, how do you then go to [H+] or [OH-]?
10^-pH or 10^-pOH
How do you write a K constant expression?
Put the products on top of reactants and don’t include any solids or liquids
How do you find the Kw values for weak acids?
You use ICE tables because these equations are reactant favored
If K is less than 1, is it reactant or product favored?
Reactant favored
If K is greater than 1, is it reactant or product favored?
Product favored
What should you always do in these problems?
IF A TEMPERATURE ISN’T PROVIDED ASSUME THAT IT IS 25 DEGREES CELSIUS
How do strong acids and bases act?
They react completely to fully ionize or fully dissociate
What is a main characteristic of strong acids and bases?
They are strong electrolytes/ conductors of electricity
If you need to calculate the molarity of OH-, for example, and they give you the molarity of Ba(OH)2, what do you do?
You need to multiply the molarity of Ba(OH)2 by 2 because there are 2 moles of OH- in the compound
The more concentrated an acid is, the ___________ the pH will be.
lower
The more concentrated a base is, the ___________ the pOH will be and the ____________ the pH will be.
lower, higher
