Defining Acids and Bases
How did Arrenhius define acids and bases?
Acids increase [H+]
Bases increase [OH-]
Acids are found WHERE on the pH scale?
HBr
hydrobromic acid
What is the pH scale based on? What does that mean?
The autoionization of water- some of it breaking up into H+ and OH-
Name at least 3 things needed for a titration
buret/burette
stopcock
analyte
titrant
stir rod
beaker
How did Bronsted-Lowry define acids and bases?
Acids are proton donors (give H+)
Bases are proton acceptors (get H+)
Acids all have H+, how many electrons does H+ have?
None
HI
hydroiodic acid
What is the pH of a solution with [H+]=0.000145 M (with correct sig figs)
3.83
What is one purpose of titrations?
Finding the Molarity of an unknown substance by finding the equivalence point
CH3COOH + H2O → CH3COO- + H3O+
Label base, acid, conjugate base, and conjugate acid
Acid, base, conjugate base, conjugate acid
Strong bonds = weak acid
Weak bonds = strong acid
The easier it is for the H+ to pop off, the stronger it is
HF
hydroflouric acid
What is the [OH-] of a solution with a pH of 3.4
2.5 x10^-11
What does a pH indicator do?
Tells us we have hit equivalence point (neutralization)
What happens when a strong acid and a strong base combine?
Neutralization- salt and water form
How would you describe a Lewis acid or base?
Electron pair receptor (acid)/Electron pair donor (base)
H2CO3
carbonic acid
The concentration of [H+] is very big or very small
What is the molarity of a solution of HCl if 34.00 mL of this solution requires 17.56 mL of 0.28 M NaOH for neutralization?
0.145 M
What are the products of the following reaction?
HNO3 + LiOH ->
H2O + LiNO3
What has been your favorite pre-bellwork question so far?
anything!
HNO2
nitrous acid
If I have a pH of 1, how many times more acidic is that than a pH of 5?
10,000x more acidic
Find the molarity of a sulfuric acid solution when 35.00 mL of this solution is titrated to a slight pink endpoint with 13.7 mL of 0.56 M KOH.
0.110 M