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Sometimes, during stress or trauma, a person can start to hyperventilate. Then the person might breathe into a paper bag to avoid fainting. (10.8) b. How does breathing into a paper bag help return blood pH to normal?
10. Acids and Bases
Gas Evolution Equations (Simplified)
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Predict the products formed from the following gas evolution equation.
A
KCl, H2CO3
B
CO2, H2O
C
KCl, CO2, H2O
D
KCl, H2, CO32–
Verified step by step guidance1
Identify the reactants in the equation: Potassium bicarbonate (KHCO₃) and hydrochloric acid (HCl).
Recognize that this is a gas evolution reaction, where an acid reacts with a bicarbonate to produce carbon dioxide gas.
Write the balanced chemical equation for the reaction: KHCO₃(aq) + HCl(aq) → KCl(aq) + CO₂(g) + H₂O(l).
Understand that the bicarbonate ion (HCO₃⁻) reacts with the hydrogen ion (H⁺) from HCl to form carbonic acid (H₂CO₃), which decomposes into CO₂ and H₂O.
Note that the potassium ion (K⁺) from KHCO₃ combines with the chloride ion (Cl⁻) from HCl to form potassium chloride (KCl) in the solution.
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