u2: titration

Question 1

titrant

Answer 1

solution in burette

Question 2

sample

Answer 2

solution analyzed in flask

Question 3

equivalence point/stoichiometric point

Answer 3

• amnt. of titrant recorded when chemically equivalent amounts have reacted
• when n H3O = n OH

Question 4

endpoint

Answer 4

point where a sharp change in a measurable/characteristic property occurs (colour, pH)

Question 5

titration curves: strong acid nd strong base

Answer 5

equivalence point at pH=7

Question 6

what does midpoint/equivalence point look like on graphs?

Answer 6

sharp increase in pH

Question 7

conjugate acid of a strong base is…

Answer 7

weak

Question 8

conjugate base of a strong acid is…

Answer 8

weak

Question 9

titration curves: strong base nd weak acid

Answer 9

equivalence point at pH above 7

Question 10

titration curves: weak base nd strong acid

Answer 10

equivalence point at pH below 7

Question 11

what are titrations not done with?

Answer 11

weak acids and weak bases

Question 12

titration curves: polyprotic acids

Answer 12

• each proton has a diff. equivalence point, so multiple vertical lines exist

Question 13

how do we solve the long III question?

Answer 13

1. make ICE table for chemical equation resulting in water+salt
2. find moles of weak acid/base and apply it to the salt based on ratio
3. find concentration of that salt in total volume of sol’n
4. make new ICE table with salt + water and determine products (where intial conc. is 0)
5. convert Ka or Kb to whtever’s needed using Kw
6. make constant expression and plug in all concentrations, apply 100 rule. Isolate for x
7. solve for pH or pOH
8. solve for pH or pOH