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CHEM1B > Lab Final > Flashcards

Lab Final Flashcards

1
Q

Write Solubility Rules table

A
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2
Q

What are strong electrolytes?

A

Strong acid, strong base, salt (ionic compound)

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3
Q

What are weak electrolytes?

A

Weak acid, weak base

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4
Q

What are non-electrolytes?

A

Molecular and Organic compounds

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5
Q

Basic Anion

A

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

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6
Q

What are some examples of basic anions?

A

Carbonate, phosphate, sulfate, acetate, cyanide and fluoride

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7
Q

Where do basic anions come from?

A

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

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8
Q

Potassium Hydrogen

A

KHP

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9
Q

What makes an effective buffer?

A

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

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10
Q

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

A

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

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11
Q

Percent Error

A

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

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12
Q

What is precision and the precision standard for titrations?

A

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

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13
Q

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

A

Unaffected

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14
Q

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

A

Too low

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15
Q

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

A

Too high

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16
Q

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

A

Too high

17
Q

Does the E-flask need to be dry?

A

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

18
Q

Does pipet need to be dry?

A

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

19
Q
A
20
Q

Common Ion Effect

A

presence of common ion decreases solubility of solids in solution

21
Q

KSP: Buret was not conditioned

A

Too high

22
Q

KSP: Ca(OH)2 solid in solution

A

Too high

23
Q

KSP: Measured 24mL instead of 25mL

A

Too high

24
Q

KSP: [HCl] was lower than bottle

A

Too high

25
Q

Construct voltaic cell and observe (-) charge?

A

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

CHEM1B (5 decks)

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