CH 110 Montana State University Chemistry Lab Report

CH 110 Pre-Labrevised Spring 2020
1. (a) A titration of 5.00 mL acetic acid required 23.14 mL of 0.2056 M sodium hydroxide for
complete neutralization. Calculate the molarity (moles/L) of the acetic acid. Note:
since the mole ratio between acetic acid and sodium hydroxide is 1:1, the following
equation applies MaVa = MbVb, where M = molarity (moles/L), V = volume, a = acid
(acetic acid), b = base (sodium hydroxide). Show the calculation and use proper
number of sig figs.
(b) Convert the answer in 1a from moles/L to g/L. (Hint: use the molar mass for acetic
acid; CH3COOH)
(c) A titration of a sample of an unknown monoprotic acid required 29.37 mL of 0.2056 M
NaOH to reach the endpoint. Calculate the number of moles of NaOH added. Show
the full calculation and use proper number of sig figs.
2. Describe the procedure for PART II (Second Week) (Steps 1 & 2) of the experiment.
This could be in an outline format or a flow chart format or paragraph format. It should
not be copied directly from the manual. (This should be between ½ and one page,
you may use the back of the page)
3. Briefly discuss all safety precautions related to this experiment.
equipment related.)
(Chemical and
CH 110
Chemical Handling and Waste Treatment
Normal laboratory safety practices must be followed at all times. SDS sheets are
available in the laboratory or on-line at; then go to Sciences; Chemistry;
Binder.HTM & search alphabetically.
The sodium hydroxide (NaOH) is a corrosive solution which is a strong eye and skin
irritant. The vinegar is a solution of acetic acid and water, which can also be an eye and
skin irritant. If contact occurs, promptly flush exposed areas with lots of cold water and
inform the instructor. These solutions should be disposed of by rinsing down the drain
with lots of cold tap water.
The unknown monoprotic acids are toxic if ingested and eye and skin irritants. Waste
unknowns must be dissolved in distilled water and rinsed down the drain with lots of tap
The phenolphthalein indicator is an alcohol solution and is flammable. No flames or
sparks may be used in the lab.

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