Lab Final

Question 1

Write Solubility Rules table

Question 2

What are strong electrolytes?

Answer 2

Strong acid, strong base, salt (ionic compound)

Question 3

What are weak electrolytes?

Answer 3

Weak acid, weak base

Question 4

What are non-electrolytes?

Answer 4

Molecular and Organic compounds

Question 5

Basic Anion

Answer 5

Any anion that reacts with water to produce hydroxide ions in solution

Question 6

What are some examples of basic anions?

Answer 6

Carbonate, phosphate, sulfate, acetate, cyanide and fluoride

Question 7

Where do basic anions come from?

Answer 7

Weak acids, because basic anions are the conjugate bases of weak acids

Question 8

Potassium Hydrogen

Answer 8

KHP

Question 9

What makes an effective buffer?

Answer 9

Concentrated enough to resist pH change
Ratio of conjugate acid and conjugate base is close to one

Question 10

Why is it important to not have any bubbles in the tip of the buret?

Answer 10

Volume measurement will be inaccurate and actual titrant volume will be lower than measured volume

Question 11

Percent Error

Answer 11

absolute value of (experimental minus actual divided by actual) x 100

Question 12

What is precision and the precision standard for titrations?

Answer 12

The ability to reproduce the experiment so that the data obtained are close to one another
4 ppt

Question 13

Will added KHP to flask w/60ml instead of 50ml of water affect the molarity of NaOH?

Answer 13

Unaffected

Question 14

How will a buret wet w/water when you add NaOH affect the molarity of NaOH?

Answer 14

Too low

Question 15

When KHP is wet when weighed how will this affect the molarity of NaOH?

Answer 15

Too high

Question 16

When you titrate past the equivalence point by 0.50 ml how will this affect the molarity of NaOH?

Answer 16

Too high

Question 17

Does the E-flask need to be dry?

Answer 17

No, because any water within the flask won’t have a direct effect on the number of moles in the solution

Question 18

Does pipet need to be dry?

Answer 18

No, pipet will be conditioned with saturated Ca(OH)2 solution.

Question 20

Common Ion Effect

Answer 20

presence of common ion decreases solubility of solids in solution

Question 21

KSP: Buret was not conditioned

Answer 21

Too high

Question 22

KSP: Ca(OH)2 solid in solution

Answer 22

Too high

Question 23

KSP: Measured 24mL instead of 25mL

Answer 23

Too high

Question 24

KSP: [HCl] was lower than bottle

Answer 24

Too high

Question 25

Construct voltaic cell and observe (-) charge?

Answer 25

Switch the leads and the voltage will have the same value, but it will be positive