A student prepares 200 ml of a 0.5M phosphate buffer at pH=6.4. What will the pH...

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A student prepares 200 ml of a 0.5M phosphate buffer at pH=6.4. What will the pH...

A student prepares 200 ml of a 0.5M phosphate buffer at pH=6.4. What will the pH be if the student dilutes this buffer to 1 liter?

A - 3.4

B - 6.0

C - 6.4

D. - 7.4

E. - 11.4

science chemistry

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Answer 1

Answer #1

pH = pKa + log[base]/[acid]

When the buffer is diluted, the concentration of acid and the base, both are reduced by the same factor. So, their ratio remains the same. Also, pKa is a constant and doesn't depend upon the concentration of the buffer. So, the pH of the buffer doesn't change.

So, the pH is 6.4

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Answer 2

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