CHEM 1B LAB EXAM QUESTIONS
COMPLETE WITH VERIFIED
ANSWERS
\.What is the indicator that is used in today's titration? - ANSWERS✔-
phenolphthalein
\.At the equivalence point, which of the following statements is/are necessarily
true? Select all that apply.
A.
Moles H+ equals moles OH-.
B.
Grams of acid equals grams of base.
C.
Molar mass of acid equals molar mass of base.
D.
The solution will change from pink to colorless.
E.
Moles indicator equals moles H+ - ANSWERS✔-A. Moles H+ equals moles OH-.
\.molar mass - ANSWERS✔-defined as the mass of a sample of that compound
divided by the amount of substance in that sample measured in moles.
, molar mass= mass/moles
\.Molarity - ANSWERS✔-Molarity= moles /volume
a description of solution concentration.
\.Titration - ANSWERS✔-the slow addition of one solution of a known
concentration (called a titrant) to a known volume of another solution of
unknown concentration until the reaction reaches neutralization, which is often
indicated by a color change.
\.Indicator - ANSWERS✔-a chemical substance added to a solution so the ending
point can be determined visually.
\.endpoint - ANSWERS✔-the point where the indicator changes color; comes after
the equivalence point
\.equivalence point - ANSWERS✔-point at which the titrant is chemically
equivalent to the analysis; before endpoint
\.Phenolphthalein - ANSWERS✔-change color when ph is 8.2
\.Buret - ANSWERS✔-a glass tube with a stopcock valve at one end, for delivering
known volumes of a liquid.
\.Volume delivered - ANSWERS✔-final-initial (positive number)
COMPLETE WITH VERIFIED
ANSWERS
\.What is the indicator that is used in today's titration? - ANSWERS✔-
phenolphthalein
\.At the equivalence point, which of the following statements is/are necessarily
true? Select all that apply.
A.
Moles H+ equals moles OH-.
B.
Grams of acid equals grams of base.
C.
Molar mass of acid equals molar mass of base.
D.
The solution will change from pink to colorless.
E.
Moles indicator equals moles H+ - ANSWERS✔-A. Moles H+ equals moles OH-.
\.molar mass - ANSWERS✔-defined as the mass of a sample of that compound
divided by the amount of substance in that sample measured in moles.
, molar mass= mass/moles
\.Molarity - ANSWERS✔-Molarity= moles /volume
a description of solution concentration.
\.Titration - ANSWERS✔-the slow addition of one solution of a known
concentration (called a titrant) to a known volume of another solution of
unknown concentration until the reaction reaches neutralization, which is often
indicated by a color change.
\.Indicator - ANSWERS✔-a chemical substance added to a solution so the ending
point can be determined visually.
\.endpoint - ANSWERS✔-the point where the indicator changes color; comes after
the equivalence point
\.equivalence point - ANSWERS✔-point at which the titrant is chemically
equivalent to the analysis; before endpoint
\.Phenolphthalein - ANSWERS✔-change color when ph is 8.2
\.Buret - ANSWERS✔-a glass tube with a stopcock valve at one end, for delivering
known volumes of a liquid.
\.Volume delivered - ANSWERS✔-final-initial (positive number)
