2 years ago

I need help with this question pls answer.

Biology

1 answer:

Andreyy892 years ago

8 0

Answer:

I think its picture B

Explanation:

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A certain buffer is made by mixing a weak acid HA and its conjugate base A–. When HA is present at a concentration of 0.5 mM and

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The dissociation constant for formic acid = $K_a=1.8\times 10^{-4}$

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First we have to calculate the value of $K_a$ .

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To calculate the ratio of the concentrations of $HA$ and $A^-$ when the buffer has a pH of 7.02.

Using Henderson Hesselbach equation :

$7.02=6.86+\log \frac{[A^-]}{[HA]}$

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$\frac{[HA]}{[A^-]}=0.69$

Thus the ratio of the concentrations of $HA$ and $A^-$ when the buffer has a pH of 7.02 is 0.69

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