Chem 1B Lab| Ques ons and answers | Updated
RATED A+ NEW EDITION | 2026
What is the indicator that is used in today's tra on?
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 solu on will change from pink to colorless.
E.
Moles indicator equals moles H+
A. Moles H+ equals moles OH-.
molar mass
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
Molarity= moles /volume
a descrip on of solu on concentra on.
Titra on
the slow addi on of one solu on of a known concentra on (called a trant) to a known volume
of another solu on of unknown concentra on un l the reac on reaches neutraliza on, which is
o2en indicated by a color change.
Indicator
, a chemical substance added to a solu on so the ending point can be determined visually.
endpoint
the point where the indicator changes color; comes a2er the equivalence point
equivalence point
point at which the trant is chemically equivalent to the analysis; before endpoint
Phenolphthalein
change color when ph is 8.2
Buret
a glass tube with a stopcock valve at one end, for delivering known volumes of a liquid.
Volume delivered
final-ini al (posi ve number)
Reading a buret
Keep your eyesight as the same level as the bo;om of the meniscus.
****Accuracy requires es ma on of the reading to the nearest 0.01 mL.***
Moles in acid sample
Moles Acid in Sample = Moles H+ in Sample / Number of Acidic Hydrogens
Molar mass
Molar Mass = Sample Mass / Moles Acid in Sample
Substances X and Y can act as oxidizing agents. Substance X is blue and substance Y is red. They
can form the ions X- and Y-, respec vely - both of which are colorless. When a blue solu on of X
is mixed with a colorless solu on containing Y- ions, the color changes from blue to red. What
are the products of the reac on? Select all that apply.
X^- & Y
Refer to the informa on in Ques on 3 to select the most correct statement below.
A.
X is oxidized.
B.
X and Y have equal strength as oxidizing agents.
RATED A+ NEW EDITION | 2026
What is the indicator that is used in today's tra on?
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 solu on will change from pink to colorless.
E.
Moles indicator equals moles H+
A. Moles H+ equals moles OH-.
molar mass
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
Molarity= moles /volume
a descrip on of solu on concentra on.
Titra on
the slow addi on of one solu on of a known concentra on (called a trant) to a known volume
of another solu on of unknown concentra on un l the reac on reaches neutraliza on, which is
o2en indicated by a color change.
Indicator
, a chemical substance added to a solu on so the ending point can be determined visually.
endpoint
the point where the indicator changes color; comes a2er the equivalence point
equivalence point
point at which the trant is chemically equivalent to the analysis; before endpoint
Phenolphthalein
change color when ph is 8.2
Buret
a glass tube with a stopcock valve at one end, for delivering known volumes of a liquid.
Volume delivered
final-ini al (posi ve number)
Reading a buret
Keep your eyesight as the same level as the bo;om of the meniscus.
****Accuracy requires es ma on of the reading to the nearest 0.01 mL.***
Moles in acid sample
Moles Acid in Sample = Moles H+ in Sample / Number of Acidic Hydrogens
Molar mass
Molar Mass = Sample Mass / Moles Acid in Sample
Substances X and Y can act as oxidizing agents. Substance X is blue and substance Y is red. They
can form the ions X- and Y-, respec vely - both of which are colorless. When a blue solu on of X
is mixed with a colorless solu on containing Y- ions, the color changes from blue to red. What
are the products of the reac on? Select all that apply.
X^- & Y
Refer to the informa on in Ques on 3 to select the most correct statement below.
A.
X is oxidized.
B.
X and Y have equal strength as oxidizing agents.
