Hello. I'm not n=sure about these answers so i was wondering if someone could check them out?
27, A: Which is a stronger acid - sulfuric or carbonic acid? (Answer: Sulfuric acid.)
27, B: Imagine you have two glasses. One contains a solution of carbonic acid. The other contains a solution of sulfuric acid. Without any other information, can you tell which is more corrosive? Explain the reasoning behind your answer.
27, C: What makes an acidic solution corrosive?
28: You have a glass of pure water. Are chemical reactions occurring in the water? If so, what are they? If not, explain why not.
29: While investigating the effects of acid rain in your area, you discover a lake that is surprisingly resistant to changes in pH caused by acid rain. Using what you have learned in this unit, explain why the lake resists changes in pH.
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27, A: The glass containing a solution of sulfuric acid is more corrosive because the acidic gas compounds have an even higher corrosive property.
27, B: There are more hydrogen atoms available to pull negatively charged atoms apart from the compound they are found in.
28: Yes, because the reaction for water is reversible, so some atoms are evaporating and others are recombining to form water molecules maintaining a balance in the solution.
29: The lake may act as a buffer and either be composed of a weak acid and its conjugate base or vice versa and therefore resists changes in the pH.
Thank you - CRCAWF
You have the answers mixed up with the number of the question to the point that the whole thing is confusing. The answer to the first question (H2SO4) is correct. The answer for what you have labeled 27A is blarney.
Hello, CRCAWF! I can help you check your answers. Let's go through each question one by one:
27, A: The correct answer is sulfuric acid. Sulfuric acid (H2SO4) is a stronger acid compared to carbonic acid (H2CO3). To determine the strength of an acid, we consider its ability to donate protons (H+ ions) in water. Sulfuric acid can donate two protons, while carbonic acid can only donate one.
27, B: Without any further information, it is not possible to determine which acid (carbonic acid or sulfuric acid) is more corrosive. Corrosiveness depends on multiple factors like concentration, temperature, and the specific substances being exposed to the acid. The answer cannot be determined solely based on the type of acid.
27, C: An acidic solution is corrosive because it has a high concentration of positively charged hydrogen ions (H+). These ions can react with certain materials, breaking them down or causing damage. The corrosive nature of acids is due to the ability of H+ ions to participate in chemical reactions, leading to the decomposition of substances.
28: Chemical reactions indeed occur in pure water, but they are in a state of dynamic equilibrium. In water, the chemical reaction involves the dissociation of water molecules into hydronium ions (H3O+) and hydroxide ions (OH-): H2O ⇄ H3O+ + OH-. However, the rate of forward and reverse reactions is equal, resulting in a constant concentration of H3O+ and OH-. Therefore, there is a balance of chemical reactions, and pure water is considered to be neutral.
29: The lake may resist changes in pH due to its buffering capacity. A buffer solution contains a weak acid and its conjugate base (or weak base and its conjugate acid). These components can absorb excess H+ ions or OH- ions, which helps stabilize the pH and prevent large fluctuations. Therefore, if the lake is composed of a buffering system, it can resist changes in pH caused by acid rain.
I hope this helps! If you have any more questions or need further clarification, feel free to ask.