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dolphi86 [110]
3 years ago
13

Following intense exercise, the blood pH was determined to be 7.1. If the HCO3- is 7.5mM and the pKa for HCO3- is 6.1, what is t

he CO2 concentration in the blood
Chemistry
1 answer:
shusha [124]3 years ago
8 0

Answer:

0.75\ \text{mM}

Explanation:

Concentration of HCO_3^- = [HCO_3^-]=7.5\ \text{mM}

pK_a for HCO_3^- = 6.1

pH of  blood = 7.1

The reaction is as follows

H_2CO_3+H_2O\rightarrow HCO_3^-+H_3O^+

From the Henderson equation we get

pH=pK_a+\log\dfrac{[HCO_3^-]}{[H_2CO_3]}\\\Rightarrow 7.1=6.1+\log \dfrac{7.5}{[H_2CO_3]}\\\Rightarrow 1=\log\dfrac{7.5}{[H_2CO_3]}\\\Rightarrow 10^1=\dfrac{7.5}{[H_2CO_3]}\\\Rightarrow [H_2CO_3]=\dfrac{7.5}{10}\\\Rightarrow [H_2CO_3]=0.75\ \text{mM}

CO_2(g)+H_2O(l)\rightarrow H_2CO_3(aq)

Concentration of H_2CO_3, [H_2CO_3]=[CO_2]

Concentration of CO_2, [CO_2]=[H_2CO_3]=0.75\ \text{mM}.

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3 0
3 years ago
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