2 a base 3 an acid correct 4 a solvent explanation

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2. a base. 3. an acid. correct 4. a solvent. Explanation: Ca(H 2 O) 2+ 6 loses H + to become Ca(H 2 O) 5 . H 2 O accepts the proton to become H 3 O + . 005 10.0 points The conjugate acid of HCO 3 is ? and the conjugate base of HCO 3 is ? . 1. CO 2 3 ; OH 2. H 2 CO 3 ; H 2 O 3. H 2 CO 3 ; CO 2 3 correct 4. CO 2 3 ; CO 2 3 5. H + ; CO 2 3 6. CO 2 3 ; H 2 CO 3
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estrada (gse77) – Homework 6 – Sutcliffe – (52410) 2 7. H 2 CO 3 ; H 2 CO 3 8. H + ; OH Explanation: To produce a conjugate acid, HCO 3 must be acting as a base. Therefore it is a proton acceptor forming H 2 CO 3 . To produce a conjugate base, it must be acting as an acid. Therefore it is a proton donator forming CO 2 3 . 006 10.0 points Which one of the following pairs of acids and their conjugate bases is INCORRECTLY matched? 1. H 3 O + : H 2 O 2. NH + 4 : NH 2 correct 3. H 2 O : OH 4. HClO : ClO 5. HF : F Explanation: An acid is a proton donor and a base is a proton acceptor. The only difference between the acid and its conjugate base is that the base has one less H atom. NH 2 has two fewer H atoms than the NH + 4 ; therefore, it is incorrectly matched. 007 10.0 points HCN is classified as a weak acid in water. This means that it produces 1. a relatively large fraction of the maximum number of possible hydronium ions. 2. no hydronium ions. 3. 100% of the maximum number of possible hydronium ions. 4. a relatively small fraction of the maximum number of possible hydronium ions. correct Explanation: In water only a small percentage of a weak acid hydrolyzes, producing H 3 O + ions.
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  • Fall '07
  • Holcombe
  • pH, Acids, Hydronium, ESTRADA

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