Are there any strong acids or bases 3 Are there any weak acids or bases 4 Do I neutralize? (strong acid and any base Strong base and any acid) 5
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Are there any strong acids or bases 3 Are there any weak acids or bases 4 Do I neutralize? (strong acid and any base Strong base and any acid) 5
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Principles of Chemistry II © Vanden Bout Today
How to solve all acid/base problems
(except the ones we'll do next week)Strong Acid
Weak Acid
Buffer
Weak Base
Strong Base
Principles of Chemistry II © Vanden BoutIf you're having trouble
go step by step1. Remove the spectator ions (Na
, Cl , NO 3,....)2. Are there any strong acids or bases3. Are there any weak acids or bases4. Do I neutralize?
(strong acid and any base. Strong base and any acid)5. Neutralize
convert everything to moles write down the correct neutralization reaction find the limiting reagent final the compounds in the solution after neutralization convert back to molarity6. Identify what is in solution and solve the equilibrium7. convert to the appropriate answer pH, pOH, [H
Principles of Chemistry II © Vanden Bout what is the pH of a solution of100 mL of a 1M weak acid with a K
a of 10 -4 and 50 mL of 1M NaOH? spectator ion? Na (H ) strong acid? No (OH ) strong base? YES (HA or BH ) weak acid? YES (B or A ) weak base? No Do I need to neutralize? Yes. I have a strong base and an acid Principles of Chemistry II © Vanden Bout what is the pH of a solution of100 mL of a 1M weak acid with a K
a of 10 -4 and 50 mL of 1M NaOH?Convert to moles
.1L x 1M = 0.1 moles of HA .05L x 1M = 0.05 moles of OH neutralization reactionOH (aq) + HA(aq) A (aq) + H 2 O(l) init0.05 moles0.1 moles0 moleschange-0.05 moles-0.05 moles+0.05 molesafter neutral0 moles0.05 moles0.05 molesICAN
not ICE Principles of Chemistry II © Vanden Bout what is the pH of a solution of100 mL of a 1M weak acid with a K
a of 10 -4 and 50 mL of 1M NaOH? neutralization reactionOH (aq) + HA(aq) A (aq) + H 2O(l) after
neutral0 moles0.05 moles0.05 molesWhat "kind" of solution is this?buffer[HA] =0.05/.15 = .333[A
] =0.05/.15 = .333 Principles of Chemistry II © Vanden Bout How do I calculate the pH for different solutions?Strong Acid [H ] = C aStrong Base
[OH ] = C bWeak Acid
[H ] = sqrt(K a C aWeak Base
[OH ] = sqrt(K b C bBuffer
[H ] =K a C a /C bBuffer
[OH ] =K b C b /C a Principles of Chemistry II © Vanden Bout what is the pH of a solution of100 mL of a 1M weak acid with a K
a of 10 -4 and 50 mL of 1M NaOH? [HA] =0.05/.15 = .333[A ] =0.05/.15 = .333Buffer [H ] =K a C a /C bBuffer
[H ] =10 -4 (.333)/(.333) = 10 -4 pH = 4pOH = 10Principles of Chemistry II © Vanden BoutWhat is the pH of a solution formed by mixing
100 mL of Acetic Acid and 100 mL of LiOH?
A. a strong acid and a strong base B. a weak acid and a strong base C. a weak acid and a weak base D. a strong acid and a weak base E. a strong acid and a weak acidAcetic Acid = HA
NaOH = OH
what acid/base species are in this solution to start?Principles of Chemistry II © Vanden BoutWhat is the pH of a solution formed by mixing
100 mL of Acetic Acid and 100 mL of LiOH?
A. yes B. no C. it depends on the molecular weight of acetic acid Do I need to neutralize this solution?Strong base and an acid OH + HA A H 2 OPrinciples of Chemistry II © Vanden BoutWhat is the pH of a solution formed by mixing
100 mL of Acetic Acid and 100 mL of LiOH?
A. HA B. A C. of HA and of AD. of OH
What is left in solution after neutralization?.1 L x 1M = .1 HA .1L x 1M = .1 OH note: this would be the equivalence point in a titrationPrinciples of Chemistry II © Vanden BoutWhat is the pH of a solution formed by mixing
100 mL of Acetic Acid and 100 mL of LiOH?
A. strong acid B. weak acid C. bufferD. weak base
E. strong base
What "kind" of equilibrium problem is this?
A is a weak base no HA in solution no H no OHPrinciples of Chemistry II © Vanden BoutWhat is the pH of a solution formed by mixing
100 mL of Acetic Acid and 100 mL of LiOH?
A. 10 -5 B. 10 -7 C. 10 -9D. 10
-14If the K
a of acetic acid 10 -5 what is K b for acetate (A K b for A = K w /K a for HA 10 -14 /10 -5 = 10 -9Principles of Chemistry II © Vanden BoutWhat is the pH of a solution formed by mixing