6. What happens to Potassium Hydroxide (KOH) when it combines with Carbon Dioxid
ID: 95627 • Letter: 6
Question
6. What happens to Potassium Hydroxide (KOH) when it combines with Carbon Dioxide?
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7. What is a meniscus?
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9. Why is it important to have a control for an experiment?
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10. How would one ensure that the three vials have an equal volume of contents?
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11. Do you think the dormant dry peas respire as much as the germinating peas? Why or why not?
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12. What does one do to account to correct for differences in gas volume that are due to temperature fluctuation rather than rate of respiration?
Explanation / Answer
Answer 6) When potassium hydroxide (KOH) combines with carbon dioxide, they react to form K2CO3 (salt) and H2O (water). KOH is a strong base (alkali) and CO2 is an acidic oxide. The product, potassium carbonate, formed by the acid-base neutralization reaction is thermodynamically stable compound.
2KOH + CO2 = K2CO3 + H2O
Answer 7) The meniscus is the curve or crescent-shaped structure formed at the upper surface of a liquid close to the surface of the container due to surface tension. Depending on the type of liquid and the surface, it can be either concave or convex.
Answer 9) A control is considered as a baseline or reference in an experiment which is used to identify any external or internal factors and compare the results. These also allow scientist to identify error or mistakes done in an experiment. Therefore, it is important to have a control for an experiment.
Answer 10) To ensure that the three vials have an equal volume of contents, the glass beads are added to the vial having dormant peas since the dry peas take up less space than an equal quantity of germinating peas.
Answer 11) The germinating peas respire more as compared to dormant dry peas. This is because germinating seeds are living and are more active, therefore, the germinating seeds consumed more oxygen. The dormant dry peas are not much active thus won't respire as much.
Answer 12) Because the temperature in the respirometers may vary during the experiment, one must correct for differences in gas volume that are due to temperature fluctuation rather than the rate of respiration. To do this, subtract any difference in the movement of water into the vial with glass beads from the experimental vials held at the same temperature. Record the result as the corrected difference.
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