Experiment 9: pH Measurements Flashcards Preview

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Flashcards in Experiment 9: pH Measurements Deck (8)
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1
Q

Define salt

A

An ionic compounds that results from the neutralization reaction of an acid and base

2
Q

Why can water never be used as a buffer?

A

Water has a pH of 7 and is thus neutral
- water is also a universal solvent and mixed with multiple other substances
= its pH can be changed easily

3
Q

How did the pH of the buffer solution change after diluting it with distilled water?

A

Did not change significantly
- increased by small increments as volume increased but hydronium ion concentration did not
= solution became more basic

4
Q

What happened to the buffer solution when a few drops of HCl were added to it.
Write down the equation.

A

Solution became more acidic as overall pH decreased due to increase in concentration of acetic acid as a result of the decrease in concentration of acetate ions

5
Q

How did the pH of the buffer solution change?

A

The ph decreases becoming more acidic

6
Q

What happened to the pH of the buffer solution after addition if a few drops of NaOH?
Write down the equation.

A

The pH increased due to the decrease in concentration of acetic acid as well as the increase in concentration of acetate ions (I.e. more conjugate base)

7
Q

How did the pH of the buffer solution change?

A

The buffer solutions pH increased this making it more basic

8
Q

What happened to the pH of distilled water after addition of a few drops of HCl and NaOH

A

The pH decreases when acid (HCl) is added:
HCl —> more acidic
The pH increases when base (NaOH) is added:
NaOH —> more basic