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SCSU CHE125 Final Exam Practice Questions and Answers (100% Pass)
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SCSU CHE125 Final Exam Practice Questions and Answers (100% Pass)
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©PREP4EXAMS @2024 [REAL EXAM DUMPS] Wednesday, July 17, 2024 1:27 AMSCSU CHE125 Final Exam Practice
Questions and Answers (100% Pass)
Percent concentration (% w/v) - ✔️✔️Number of grams of solute / 100 mL of solution
How many grams of NaCl are needed to make 250 mL of a 0.90% (w/v) solution? - ✔️✔️2.3g
NaCl
Molarity (M) - ✔️✔️moles of solute (n) / volume of solution (L)
Dilution - ✔️✔️M1V1 = M2V2
Parts per million - ✔️✔️1 gram of solute / number of grams of solution x 10^6
Parts per billion - ✔️✔️1 gram of solute / number of grams of solution x 10^9
Density of water - ✔️✔️1.0g / mL
3 memorized strong acids - ✔️✔️HCl = hydrochloric acid
H2SO4 = sulfuric acid
HNO3 = nitric acid
Monoprotic acid - ✔️✔️Can donate up to 1 proton (H+)
Diprotic acid - ✔️✔️Can donate up to 2 protons (H+)
Triprotic acid - ✔️✔️Can donate up to 3 protons (H+)
Amphiprotic - ✔️✔️A substance that can act as either an acid or a base
Relationship between pKa and Ka - ✔️✔️pKa = -log([Ka])
What is Kw - ✔️✔️Ion product of water
Kw = 10^-14
Relationship between H+, OH-, and Kw - ✔️✔️H+ x OH- = 10^-14
Relationship between pH and hydronium - ✔️✔️(H3O+) pH = -log[H+]
Relationship between pOH and hydroxide (OH-) - ✔️✔️pOH = -log([OH-])
Relationship between pH and pOH - ✔️✔️pH + pOH = 14
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, ©PREP4EXAMS @2024 [REAL EXAM DUMPS] Wednesday, July 17, 2024 1:27 AM
Relationship between pH and H+ - ✔️✔️pH = -log([H+])
Henderson-Hasselbalch equation - ✔️✔️pH = pKa + log([A-]/[HA])
Relationship between H+, A-, HA, and Ka - ✔️✔️Ka = ([H+] x [A-])/[HA]
Relationship between H+, HA, and Ka - ✔️✔️[H+] = √(Ka x [HA] )
When is a solution acidic? - ✔️✔️When its pH is less than 7.0
When is a solution basic? - ✔️✔️When its pH is greater than 7.0
When is a solution neutral? - ✔️✔️When its pH is equal to 7.0
Depronated form - ✔️✔️Conjugate base form
Protonated form - ✔️✔️Conjugate acid form
Equation when H+ ions are added - ✔️✔️H+ + A- → HA
Equation when OH- ions are added - ✔️✔️OH- + HA → H2O + A-
Which has the larger numerical value: the pKa of a stronger acid or the pKa of a weaker
acid? - ✔️✔️A weaker acid
True or False:
The pH of a 1.0 M H3PO4 solution is the same as the pH of a 1.0 M H2CO3 solution? -
✔️✔️False
The pH of a sodium formate (HCOONa) solution is
a. lower than 7
b. equal to 7
c. higher than 7
d. can't be determined - ✔️✔️c. higher than 7
Which of the following is a buffer solution? A solution that is
a. 0.1 M HCl and 0.1 M NaCl
b. 0.5 M acetic acid and 0.5 M sodium chloride
c. 02 M sodium acetate and 0.2 M HCl
d. 0.1 M acetic acid and 0.5 M sodium acetate - ✔️✔️d. 0.1 M acetic acid and 0.5 M sodium
acetate
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