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guajiro [1.7K]
1 year ago
8

You have a 250. -ml sample of 1. 28 m acetic acid (ka = 1. 8 x´ 10–5). calculate the ph of the best buffer.

Chemistry
2 answers:
exis [7]1 year ago
7 0

The ideal buffer's pH value is 4.74..

What is best buffer ?

The Best Buffer is a buffer that has equal amounts of the weak acid and its conjugate base. It responds well to the addition of acids and bases in order to fend off pH changes. A mixture of the weak base and its conjugate acid, or the weak acid and its conjugate base, is referred to as a buffer solution.

Here weak acid is acetic acid CH3COOH

The following equation can be used to determine a buffer's pH:

pH = pka + logconjugate baseweak acid

Now, the weak acid and its conjugate base are present in equal amounts in the optimal buffer.

Therefore,

Conjugate base = weak acid

This implies that,

pH = pka + log 1

pH = pka  + 0

pH = pka

Now, pka can be written as -log ka

The value of ka is given as 1.8 * 10-5

Therefore,

pH = -log (1.8 * 10-5)

pH = 4.74

As a result, the ideal buffer has a pH of 4.74..

Learn more about the pH on

brainly.com/question/22390063

#SPJ4

Nadya [2.5K]1 year ago
4 0

The ph of the best buffer is 4.74

The given acetic acid is a weak acid

The equation of the pH of the buffer

pH = pKa + log ( conjugate base / weak acid ).

For best buffer the concentration of the weak acid and its conjugate base is equal.

pH = pKa + log 1

pH = pKa + 0

pH = pKa

given Ka = 1.8 × 10⁻⁵

pKa = - log ka

pH = -log ( 1.8 × 10⁻⁵ )

pH = 4. 74

Hence the pH of the best buffer is 4.74

Learn more about the pH on

brainly.com/question/22390063

#SPJ4

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Answer:

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Explanation:

Hello there!

In this case, by bearing to to mind the given conditions, it is firstly possible to determine the initial volume of the closed system via the ideal gas equation:

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Best regards!

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<u>When reacting:</u>

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