Experiment 9: pH Measurements Flashcards Preview

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

Define salt

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

2

Why can water never be used as a buffer?

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

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

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

4

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

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

How did the pH of the buffer solution change?

The ph decreases becoming more acidic

6

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

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

How did the pH of the buffer solution change?

The buffer solutions pH increased this making it more basic

8

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

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