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Part B
At a pH of 7.40, what is the ratio of the molar concentrations of HPO42- to H2PO4-? Express your answer using two significant figures.
[HPO42- ] ⁄ [H2PO4- ] = 19
Part C
At a pH of 7.40, what is the ratio of the molar concentrations of H2PO4– to H3PO4? Express your answer using two significant figures.
[H2PO4–] ⁄ [H3PO4] = 19
Part D
At a pH of 7.40, what is the ratio of the molar concentrations of CO32- to HCO3– ? Express your answer using two significant figures.
[CO32- ] ⁄ [HCO3–] =
Part E
At a pH of 7.40, what is the ratio of the molar concentrations of HCO3– to H2CO3? Express your answer using two significant figures.
[ HCO3–] ⁄ [H2CO3] =
The following table gives the acid dissociation constant values, Ka, for carbonic acid, H2CO3 and phosphonc acid, H3PO4.
Acid | Ka1 | Ka2 | Ka3 |
H2CO3 | 4.3×10-7 | 5.6×10-11 | not applicable |
H3PO4 | 7.2×10-5 | 6.2×10-8 | 4.2×10-13 |
pH of blood
The two most important inorganic blood buffers (acid-base conjugate pairs) are the phosphoric acid and carbonic acid systems. The pH of normal blood is 7.40 .
♦ Relevant knowledge
The pH of blood is usually controlled by the brain the kidneys, and lungs. If the blood’s pH fluctuates outside of its normal alkaline pH, it can cause harm to the body’s tissues and organs. The system that helps control blood pH involves the creation of carbonate by kidneys.
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1 Answer