Chemistry: An Atoms-Focused Approach
14th Edition
ISBN: 9780393912340
Author: Thomas R. Gilbert, Rein V. Kirss, Natalie Foster
Publisher: W. W. Norton & Company
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3. The pH of the given solution of lactic acid and lactate is 4.30. Calculate the pKa
of lactic acid, when the concentration of lactic acid and lactate are 0.020 M and
0.073 M respectively.
6.
A nucleotide is the basic building block of nucleic acids. RNA and DNA are polymers made of
long chains of nucleotides. A nucleotide consists of a sugar molecule (either ribose in RNA or deoxyribose
in DNA) attached to a phosphate group and a nitrogen-containing base (the red nitrogen atom is connected
to a sugar molecules).
NH₂
adenine (A)
HN.
NH₂
NH
(a)
paired bases by hydrogen bonding.
NH₂
HN
HN
cytosine (C)
guanine (G)
thymine (T)
uracil (U)
Which bases will make hydrogen-bonds together within an DNA? Draw structures of the
(b)
Which bases will make hydrogen-bonds together within an RNA? Draw structures of the
paired bases by hydrogen bonding.
Oxacarbazepine ( C15H12N2O) is used to treat epilepsy. What would happen to the equilibrium of oxacarbazepine in water when more oxacarbazepine is added to the system?
a.) Ratef < Rateb and the equilibrium would shift to reactants (to the left)
b.) Ratef > Rateb and the equilibrium would shift to reactants (to the left)
c.) Ratef < Rateb and the equilibrium would shift to products (to the right)
d.) Ratef > Rateb and the equilibrium would shift to products (to the right)
Chapter 15 Solutions
Chemistry: An Atoms-Focused Approach
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- Answer questions a through c: a. A CHEM 1215L student prepares a dilute solution of sodium hydroxide, NaOH(aq), starting with 6 M sodium hydroxide. She then titrates a 1.372 g sample of KHP with the dilute sodium hydroxide solution, NaOH (aq), to a phenolphthalein end point. If the titration required 21.84 mL of sodium hydroxide, NaOH(aq), calculate the molar concentration of the sodium hydroxide solution, NaOH (aq). (Remember that KHP is potassium hydrogen phthalate KHC8H4O4, NOT potassium hydrogen phosphorus!) b. The student uses the same sodium hydroxide to titrate 10.00 mL of vinegar to a phe- nolphthalein end point. If the titration required 27.48 mL of sodium hydroxide, NaOH (aq), calculate the molar concentration of acetic acid, HC2H3O2 (aq), in the vinegar. c. Calculate the mass percent of acetic acid, HC2H3O2 (aq), in the vinegar using the mo- lar concentration for acetic acid, HC2H3O2 (aq), determined in part band assuming the density of the solution is 1.01 g/mL.arrow_forward8. Fehling's reagent is:A) A solution of copper sulfate in sulfuric acidB) A mixture of a solution of copper sulfate and tartaric acid with the addition of sodium hydroxideC) A mixture of a solution of copper sulfate in sulfuric acid and potassium hydrogen tartrate with sodium hydroxideD) A solution of tartaric acid in potassium hydroxidearrow_forwardWrite the equation for the reaction that goes with this equilibrium constant. (Use H30* instead of H*.)arrow_forward
- What is the decomposition or dissociation equation of tartaric acid (C4H6O6)?arrow_forwardWhat is the pH of a buffer with that has a formic acid concentration of 0.75 M and a sodium formate concentration of 0.75 M? The pKa of formic acid 3.74.arrow_forwardThe following reaction is unbalanced. HF+SiO2⟶H2SiF6+H2Oarrow_forward
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