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- Using a pH meter, you find the pH of an unknown solution to be 8.0. How would you describe this solution? a. weakly acidic b. strongly acidic c. weakly basic d. strongly basicWater molecules have one oxygen atom that is more electronegative than the two hydrogen atoms bound to it. As a result, which type of bonding hold water molecules together a. non-popular covalent bonding b. polar covalent bonding c.ionic bonding d.hydriohocicWhich of the following describes a buffer? A. The measure of the amount of hydrogen ions in a liquid B. A set of chemicals that can keep the pH of a solution stable by alternately donating and accepting the ions that contribute to pH C. A substance that releases hydrogen ions in water D. A substance that accepts hydrogen ions in water
- A homogeneous mixture consists of 12% ethanol, 28% methanol and 60% water. Which of these is the solvent for the mixture? A) ethanol B) methanol C) water D) Ethanol and MethanolWhich of the following would be most effective as a buffer? A. pure water B. a mixture of molecules that are bonded to each other with hydrogen bonds C. a mixture of unbonded atoms D. a mixture of molecules with ionic bonds that will break apart into ions E. a mixture of nonpolar moleculeswhich of the following is a characteristic of a buffer? a. The pH will go down significantly when H3O+ is added to the buffer b. The pH will go down very slightly when H3O+ is added to the buffer c. The pH will go up significantly when H3O+ is added to the buffer
- Which of the following statements is true? a. Acids and bases cannot mix together. b. Acids and bases will neutralize each other. c. Acids, but not bases, can change the pH of a solution. d. Acids donate hydroxide ions (OH–); bases donate hydrogen ions (H+).This occurs when the cations and anions are attracted to the positive and negative ends of water molecules: A. ionic bonding B. dissociation C. covalent bonding D. hydrogen bondingWhich of the following ingredients in Ding Dong Cakes are added for the purpose of maintaining pH until you consume them: a. sodium chloride b. sodium citrate/citric acid c. sodium malate/malic acid d. monosodium phosphate/disodium phosphate e. lecithin
- A pH of 3 is a. basic b. neutral c. acidicd. a bufferWhich among the following is an example of a pharmaceutically important buffer system? a. All of the choices b. Sorensen's buffer c. Palitzsch's buffer d. Gifford's bufferYou have a buffer with a pH of 10. You add a little bit of weak acid. What most likely will happen? a) The pH goes to 7 b) The pH should stay at 10 c) The pH goes up to 11 d) The pH goes down to 9
