In a partial pressure of oxygen (PCO2) electrode, carbon dioxide does which of the following? 1. ...

(Answer to Q. 1)  ANS: D
A PCO2 electrode is basically a pH electrode covered with a carbon dioxidepermeable Teflon or silicone (Silastic) membrane. A bicarbonate-buffered solution is held between the Teflon mem-brane and the pH glass electrode by a nylon spacer. CO2 from the blood diffuses across the sem-ipermeable Teflon membrane and reacts with the water to form carbonic acid, which dissociates into hydrogen ions and bicarbonate.

(Answer to Q. 2)  ANS: C
Sorenson introduced the term pH as a shorthand way to express the hydrogen ion activity of so-lutions. It is defined as the negative logarithm (base 10) of the hydrogen ion concentration, or pH = log10H+.

(Answer to Q. 3)  ANS: B
In general chemistry textbooks, a pH of 7 represents universal neutrality, where the concentration of hydrogen ions (1  107 mol/L) and hydroxyl ions (1  107 mol/L) is equal. This is the pH of pure water.

(Answer to Q. 4)  ANS: D
A blood pH that is greater than 7.40 is alkalotic. Therefore, a pH of 7.50 is alkalotic. A blood pH that is less than 7.40 is acidotic. Therefore, a pH of 7.30 is acidotic.

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