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CHEM 123 LAB FINAL UBC EXAM LATEST 2026-2027 ACTUAL EXAM
WITH COMPLETE QUESTIONS AND CORRECT DETAILED ANSWERS
(100% VERIFIED ANSWERS) |ALREADY GRADED A+| ||PROFESSOR
VERIFIED|| ||BRANDNEW!!!||
How to calibrate the drop counter - ANSWER-- immerse the pH
probe in the solution & set computer to take pH reading whenever
a drop is added
- we calibrate microlab by measuring the volume of approximately
100 drops of solution delivered from a drop dispenser
- drop counter is selected from microlab's sensor menu & the
formula tool is used to convert drops to volume in mL (so graph
reads directly in volume)
- volume = (counter reading in drops)(mL of solution measured by
difference)/100 drops
How to calibrate drop dispenser - ANSWER-- fill the drop
dispenser with deionized water
- open the valve & turn the flow rate knob
- slow the rate to a drop every half a second & make sure the light
is flashing with each drop
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- press start on microlab and make sure drops are going up in
ones
Are you allowed to change the flow rate after you've set it? -
ANSWER-no you cannot - it will change the drop size and thus
the volume
beaker - ANSWER-- measuring volumes of liquids and
transporting chemicals
- not very precise
Erlenmeyer flask - ANSWER-- good for storing, swirling, and
heating liquids
- used for titrations (helps prevent liquid from splashing out due to
its long neck)
volumetric flask - ANSWER-- used to make a standard solution of
a fixed volume precisely when filled to the calibration mark
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graduated cylinder - ANSWER-used for general measuring of
liquids (not used for quantitative analysis, as it isn't very precise)
buret - ANSWER-- graduated glass tube with a tap at one end
and is used for delivering known volumes of a liquid (good for
titrations)
- long, graduated, glass tube with stopcock at lowered end and
has a tapered glass tip
volumetric pipette - ANSWER-- good for extremely precise
measurements
- bulb is used to draw liquid up into the pipette to the calibration
line
serological pipette - ANSWER-- delivers solution in 1mL
increments (total volume is 10mL)
- last drop in tip must be blown out
top loading balance - ANSWER-- used to weigh a sample where a
high degree of accuracy is not needed
CHEM 123 LAB FINAL UBC EXAM LATEST 2026-2027 ACTUAL EXAM
WITH COMPLETE QUESTIONS AND CORRECT DETAILED ANSWERS
(100% VERIFIED ANSWERS) |ALREADY GRADED A+| ||PROFESSOR
VERIFIED|| ||BRANDNEW!!!||
How to calibrate the drop counter - ANSWER-- immerse the pH
probe in the solution & set computer to take pH reading whenever
a drop is added
- we calibrate microlab by measuring the volume of approximately
100 drops of solution delivered from a drop dispenser
- drop counter is selected from microlab's sensor menu & the
formula tool is used to convert drops to volume in mL (so graph
reads directly in volume)
- volume = (counter reading in drops)(mL of solution measured by
difference)/100 drops
How to calibrate drop dispenser - ANSWER-- fill the drop
dispenser with deionized water
- open the valve & turn the flow rate knob
- slow the rate to a drop every half a second & make sure the light
is flashing with each drop
,2|Page
- press start on microlab and make sure drops are going up in
ones
Are you allowed to change the flow rate after you've set it? -
ANSWER-no you cannot - it will change the drop size and thus
the volume
beaker - ANSWER-- measuring volumes of liquids and
transporting chemicals
- not very precise
Erlenmeyer flask - ANSWER-- good for storing, swirling, and
heating liquids
- used for titrations (helps prevent liquid from splashing out due to
its long neck)
volumetric flask - ANSWER-- used to make a standard solution of
a fixed volume precisely when filled to the calibration mark
, 3|Page
graduated cylinder - ANSWER-used for general measuring of
liquids (not used for quantitative analysis, as it isn't very precise)
buret - ANSWER-- graduated glass tube with a tap at one end
and is used for delivering known volumes of a liquid (good for
titrations)
- long, graduated, glass tube with stopcock at lowered end and
has a tapered glass tip
volumetric pipette - ANSWER-- good for extremely precise
measurements
- bulb is used to draw liquid up into the pipette to the calibration
line
serological pipette - ANSWER-- delivers solution in 1mL
increments (total volume is 10mL)
- last drop in tip must be blown out
top loading balance - ANSWER-- used to weigh a sample where a
high degree of accuracy is not needed
