This chemistry question involves key chemical concepts and calculations. The detailed solution below walks through each step, from identifying the reaction type to computing the final answer.
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1.1.17. When carbon dioxide (CO_2) dissolves in pure water, it reacts to form carbonic acid (H_2CO_3). CO_2(g) + H_2O(l) H_2CO_3(aq) Since carbonic acid is an acid, it will lower the pH of the solution from the neutral pH of 7. The correct option is C. C. The pH will drop below 7 1.1.18. When phosphorus burns in oxygen, it forms phosphorus pentoxide (P_4O_10), which is an acidic oxide. When this powder dissolves in water, it forms phosphoric acid (H_3PO_4). P_4O_10(s) + 6H_2O(l) 4H_3PO_4(aq) Acids turn universal indicator red. The correct option is C. C. The indicator will turn red 1.1.19. Acids have several characteristic properties. A. Turning red litmus paper blue is a property of bases. Acids turn blue litmus paper red. B. A pH value greater than 7 is a property of bases. Acids have a pH value less than 7. C. Feeling slippery or soapy to the touch is a property of bases. D. Tasting sour is a common property of acids. The correct option is D. D. It tastes sour 1.1.20. A neutral solution is one that is neither acidic nor basic. On the pH scale, a value of 7 indicates a neutral solution. The correct option is D. D. 7 1.1.21. We need to identify which of the given substances is a common household example of a base. A. Baking soda (sodium bicarbonate) is a common household base. B. Vinegar (acetic acid) is a common household acid. The correct option is A. A. Baking soda That's 2 down. 3 left today — send the next one.